Initial Ozone Exceedance Analysis for July 27, 2026

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• Wildfire: Keller Fire
  Acres Burned: 10.00
  Date Created: July 26, 2026
  Date extinguished: July 27, 2026
  Date Last Updated: July 27, 2026, 1:22 p.m.
  
• Wildfire: Fish Fire
  Acres Burned: 4201.00
  Date Created: July 27, 2026
  Date extinguished: None
  Date Last Updated: July 30, 2026, 5:40 p.m.
  
• Wildfire: Creelman Fire
  Acres Burned: 347.00
  Date Created: July 22, 2026
  Date extinguished: July 25, 2026
  Date Last Updated: July 24, 2026, 6:29 p.m.
  
• Wildfire: Tin Fire
  Acres Burned: 37.00
  Date Created: July 26, 2026
  Date extinguished: July 27, 2026
  Date Last Updated: July 27, 2026, 12:45 a.m.
  
• Wildfire: Rider Fire
  Acres Burned: 140.00
  Date Created: July 21, 2026
  Date extinguished: None
  Date Last Updated: July 26, 2026, 6:24 a.m.
  
• Wildfire: Kirby Fire
  Acres Burned: 46.00
  Date Created: July 23, 2026
  Date extinguished: None
  Date Last Updated: July 26, 2026, 6:15 a.m.
  

• Wildfire: Keller Fire
  Acres Burned: 10.00
  Date Created: July 26, 2026
  Date extinguished: July 27, 2026
  Date Last Updated: July 27, 2026, 1:22 p.m.
  
• Wildfire: Fish Fire
  Acres Burned: 4201.00
  Date Created: July 27, 2026
  Date extinguished: None
  Date Last Updated: July 30, 2026, 5:40 p.m.
  
• Wildfire: Creelman Fire
  Acres Burned: 347.00
  Date Created: July 22, 2026
  Date extinguished: July 25, 2026
  Date Last Updated: July 24, 2026, 6:29 p.m.
  
• Wildfire: Tin Fire
  Acres Burned: 37.00
  Date Created: July 26, 2026
  Date extinguished: July 27, 2026
  Date Last Updated: July 27, 2026, 12:45 a.m.
  
• Wildfire: Rider Fire
  Acres Burned: 140.00
  Date Created: July 21, 2026
  Date extinguished: None
  Date Last Updated: July 26, 2026, 6:24 a.m.
  
• Wildfire: Kirby Fire
  Acres Burned: 46.00
  Date Created: July 23, 2026
  Date extinguished: None
  Date Last Updated: July 26, 2026, 6:15 a.m.
  

• Wildfire: Keller Fire
  Acres Burned: 10.00
  Date Created: July 26, 2026
  Date extinguished: July 27, 2026
  Date Last Updated: July 27, 2026, 1:22 p.m.
  
• Wildfire: Fish Fire
  Acres Burned: 4201.00
  Date Created: July 27, 2026
  Date extinguished: None
  Date Last Updated: July 30, 2026, 5:40 p.m.
  
• Wildfire: Creelman Fire
  Acres Burned: 347.00
  Date Created: July 22, 2026
  Date extinguished: July 25, 2026
  Date Last Updated: July 24, 2026, 6:29 p.m.
  
• Wildfire: Tin Fire
  Acres Burned: 37.00
  Date Created: July 26, 2026
  Date extinguished: July 27, 2026
  Date Last Updated: July 27, 2026, 12:45 a.m.
  
• Wildfire: Rider Fire
  Acres Burned: 140.00
  Date Created: July 21, 2026
  Date extinguished: None
  Date Last Updated: July 26, 2026, 6:24 a.m.
  
• Wildfire: Kirby Fire
  Acres Burned: 46.00
  Date Created: July 23, 2026
  Date extinguished: None
  Date Last Updated: July 26, 2026, 6:15 a.m.
  

• Wildfire: Keller Fire
  Acres Burned: 10.00
  Date Created: July 26, 2026
  Date extinguished: July 27, 2026
  Date Last Updated: July 27, 2026, 1:22 p.m.
  
• Wildfire: Fish Fire
  Acres Burned: 4201.00
  Date Created: July 27, 2026
  Date extinguished: None
  Date Last Updated: July 30, 2026, 5:40 p.m.
  
• Wildfire: Creelman Fire
  Acres Burned: 347.00
  Date Created: July 22, 2026
  Date extinguished: July 25, 2026
  Date Last Updated: July 24, 2026, 6:29 p.m.
  
• Wildfire: Tin Fire
  Acres Burned: 37.00
  Date Created: July 26, 2026
  Date extinguished: July 27, 2026
  Date Last Updated: July 27, 2026, 12:45 a.m.
  
• Wildfire: Rider Fire
  Acres Burned: 140.00
  Date Created: July 21, 2026
  Date extinguished: None
  Date Last Updated: July 26, 2026, 6:24 a.m.
  
• Wildfire: Kirby Fire
  Acres Burned: 46.00
  Date Created: July 23, 2026
  Date extinguished: None
  Date Last Updated: July 26, 2026, 6:15 a.m.
  

• Wildfire: Keller Fire
  Acres Burned: 10.00
  Date Created: July 26, 2026
  Date extinguished: July 27, 2026
  Date Last Updated: July 27, 2026, 1:22 p.m.
  
• Wildfire: Fish Fire
  Acres Burned: 4201.00
  Date Created: July 27, 2026
  Date extinguished: None
  Date Last Updated: July 30, 2026, 5:40 p.m.
  
• Wildfire: Creelman Fire
  Acres Burned: 347.00
  Date Created: July 22, 2026
  Date extinguished: July 25, 2026
  Date Last Updated: July 24, 2026, 6:29 p.m.
  
• Wildfire: Tin Fire
  Acres Burned: 37.00
  Date Created: July 26, 2026
  Date extinguished: July 27, 2026
  Date Last Updated: July 27, 2026, 12:45 a.m.
  
• Wildfire: Rider Fire
  Acres Burned: 140.00
  Date Created: July 21, 2026
  Date extinguished: None
  Date Last Updated: July 26, 2026, 6:24 a.m.
  
• Wildfire: Kirby Fire
  Acres Burned: 46.00
  Date Created: July 23, 2026
  Date extinguished: None
  Date Last Updated: July 26, 2026, 6:15 a.m.
  

• Wildfire: Keller Fire
  Acres Burned: 10.00
  Date Created: July 26, 2026
  Date extinguished: July 27, 2026
  Date Last Updated: July 27, 2026, 1:22 p.m.
  
• Wildfire: Fish Fire
  Acres Burned: 4201.00
  Date Created: July 27, 2026
  Date extinguished: None
  Date Last Updated: July 30, 2026, 5:40 p.m.
  
• Wildfire: Creelman Fire
  Acres Burned: 347.00
  Date Created: July 22, 2026
  Date extinguished: July 25, 2026
  Date Last Updated: July 24, 2026, 6:29 p.m.
  
• Wildfire: Tin Fire
  Acres Burned: 37.00
  Date Created: July 26, 2026
  Date extinguished: July 27, 2026
  Date Last Updated: July 27, 2026, 12:45 a.m.
  
• Wildfire: Rider Fire
  Acres Burned: 140.00
  Date Created: July 21, 2026
  Date extinguished: None
  Date Last Updated: July 26, 2026, 6:24 a.m.
  
• Wildfire: Kirby Fire
  Acres Burned: 46.00
  Date Created: July 23, 2026
  Date extinguished: None
  Date Last Updated: July 26, 2026, 6:15 a.m.
  

• Wildfire: Keller Fire
  Acres Burned: 10.00
  Date Created: July 26, 2026
  Date extinguished: July 27, 2026
  Date Last Updated: July 27, 2026, 1:22 p.m.
  
• Wildfire: Fish Fire
  Acres Burned: 4201.00
  Date Created: July 27, 2026
  Date extinguished: None
  Date Last Updated: July 30, 2026, 5:40 p.m.
  
• Wildfire: Creelman Fire
  Acres Burned: 347.00
  Date Created: July 22, 2026
  Date extinguished: July 25, 2026
  Date Last Updated: July 24, 2026, 6:29 p.m.
  
• Wildfire: Tin Fire
  Acres Burned: 37.00
  Date Created: July 26, 2026
  Date extinguished: July 27, 2026
  Date Last Updated: July 27, 2026, 12:45 a.m.
  
• Wildfire: Rider Fire
  Acres Burned: 140.00
  Date Created: July 21, 2026
  Date extinguished: None
  Date Last Updated: July 26, 2026, 6:24 a.m.
  
• Wildfire: Kirby Fire
  Acres Burned: 46.00
  Date Created: July 23, 2026
  Date extinguished: None
  Date Last Updated: July 26, 2026, 6:15 a.m.
  

• Wildfire: Keller Fire
  Acres Burned: 10.00
  Date Created: July 26, 2026
  Date extinguished: July 27, 2026
  Date Last Updated: July 27, 2026, 1:22 p.m.
  
• Wildfire: Fish Fire
  Acres Burned: 4201.00
  Date Created: July 27, 2026
  Date extinguished: None
  Date Last Updated: July 30, 2026, 5:40 p.m.
  
• Wildfire: Creelman Fire
  Acres Burned: 347.00
  Date Created: July 22, 2026
  Date extinguished: July 25, 2026
  Date Last Updated: July 24, 2026, 6:29 p.m.
  
• Wildfire: Tin Fire
  Acres Burned: 37.00
  Date Created: July 26, 2026
  Date extinguished: July 27, 2026
  Date Last Updated: July 27, 2026, 12:45 a.m.
  
• Wildfire: Rider Fire
  Acres Burned: 140.00
  Date Created: July 21, 2026
  Date extinguished: None
  Date Last Updated: July 26, 2026, 6:24 a.m.
  
• Wildfire: Kirby Fire
  Acres Burned: 46.00
  Date Created: July 23, 2026
  Date extinguished: None
  Date Last Updated: July 26, 2026, 6:15 a.m.
  

• Wildfire: Keller Fire
  Acres Burned: 10.00
  Date Created: July 26, 2026
  Date extinguished: July 27, 2026
  Date Last Updated: July 27, 2026, 1:22 p.m.
  
• Wildfire: Fish Fire
  Acres Burned: 4201.00
  Date Created: July 27, 2026
  Date extinguished: None
  Date Last Updated: July 30, 2026, 5:40 p.m.
  
• Wildfire: Creelman Fire
  Acres Burned: 347.00
  Date Created: July 22, 2026
  Date extinguished: July 25, 2026
  Date Last Updated: July 24, 2026, 6:29 p.m.
  
• Wildfire: Tin Fire
  Acres Burned: 37.00
  Date Created: July 26, 2026
  Date extinguished: July 27, 2026
  Date Last Updated: July 27, 2026, 12:45 a.m.
  
• Wildfire: Rider Fire
  Acres Burned: 140.00
  Date Created: July 21, 2026
  Date extinguished: None
  Date Last Updated: July 26, 2026, 6:24 a.m.
  
• Wildfire: Kirby Fire
  Acres Burned: 46.00
  Date Created: July 23, 2026
  Date extinguished: None
  Date Last Updated: July 26, 2026, 6:15 a.m.
  

• Wildfire: Keller Fire
  Acres Burned: 10.00
  Date Created: July 26, 2026
  Date extinguished: July 27, 2026
  Date Last Updated: July 27, 2026, 1:22 p.m.
  
• Wildfire: Fish Fire
  Acres Burned: 4201.00
  Date Created: July 27, 2026
  Date extinguished: None
  Date Last Updated: July 30, 2026, 5:40 p.m.
  
• Wildfire: Creelman Fire
  Acres Burned: 347.00
  Date Created: July 22, 2026
  Date extinguished: July 25, 2026
  Date Last Updated: July 24, 2026, 6:29 p.m.
  
• Wildfire: Tin Fire
  Acres Burned: 37.00
  Date Created: July 26, 2026
  Date extinguished: July 27, 2026
  Date Last Updated: July 27, 2026, 12:45 a.m.
  
• Wildfire: Rider Fire
  Acres Burned: 140.00
  Date Created: July 21, 2026
  Date extinguished: None
  Date Last Updated: July 26, 2026, 6:24 a.m.
  
• Wildfire: Kirby Fire
  Acres Burned: 46.00
  Date Created: July 23, 2026
  Date extinguished: None
  Date Last Updated: July 26, 2026, 6:15 a.m.
  

• Wildfire: Keller Fire
  Acres Burned: 10.00
  Date Created: July 26, 2026
  Date extinguished: July 27, 2026
  Date Last Updated: July 27, 2026, 1:22 p.m.
  
• Wildfire: Fish Fire
  Acres Burned: 4201.00
  Date Created: July 27, 2026
  Date extinguished: None
  Date Last Updated: July 30, 2026, 5:40 p.m.
  
• Wildfire: Creelman Fire
  Acres Burned: 347.00
  Date Created: July 22, 2026
  Date extinguished: July 25, 2026
  Date Last Updated: July 24, 2026, 6:29 p.m.
  
• Wildfire: Tin Fire
  Acres Burned: 37.00
  Date Created: July 26, 2026
  Date extinguished: July 27, 2026
  Date Last Updated: July 27, 2026, 12:45 a.m.
  
• Wildfire: Rider Fire
  Acres Burned: 140.00
  Date Created: July 21, 2026
  Date extinguished: None
  Date Last Updated: July 26, 2026, 6:24 a.m.
  
• Wildfire: Kirby Fire
  Acres Burned: 46.00
  Date Created: July 23, 2026
  Date extinguished: None
  Date Last Updated: July 26, 2026, 6:15 a.m.
  

• Wildfire: Keller Fire
  Acres Burned: 10.00
  Date Created: July 26, 2026
  Date extinguished: July 27, 2026
  Date Last Updated: July 27, 2026, 1:22 p.m.
  
• Wildfire: Fish Fire
  Acres Burned: 4201.00
  Date Created: July 27, 2026
  Date extinguished: None
  Date Last Updated: July 30, 2026, 5:40 p.m.
  
• Wildfire: Creelman Fire
  Acres Burned: 347.00
  Date Created: July 22, 2026
  Date extinguished: July 25, 2026
  Date Last Updated: July 24, 2026, 6:29 p.m.
  
• Wildfire: Tin Fire
  Acres Burned: 37.00
  Date Created: July 26, 2026
  Date extinguished: July 27, 2026
  Date Last Updated: July 27, 2026, 12:45 a.m.
  
• Wildfire: Rider Fire
  Acres Burned: 140.00
  Date Created: July 21, 2026
  Date extinguished: None
  Date Last Updated: July 26, 2026, 6:24 a.m.
  
• Wildfire: Kirby Fire
  Acres Burned: 46.00
  Date Created: July 23, 2026
  Date extinguished: None
  Date Last Updated: July 26, 2026, 6:15 a.m.
  

On July 27, 2026, an analysis was conducted to assess the potential impact of nearby fire activity on ozone levels at Redlands - Dearborn. 5 wildfires were detected within 100 miles of the site from two days before the event to the event day. The proximity of these fires to the site suggests they may have contributed to elevated ozone levels on this date. The following wildfires were identified: Rider Fire, which burned 140.00, started on July 21, 2026, and last updated on July 26, 2026. It was located 17.5 miles away. Creelman Fire, which burned 347.00, started on July 22, 2026, and ended on July 25, 2026. It was located 74.2 miles away. Kirby Fire, which burned 46.00, started on July 23, 2026, and last updated on July 26, 2026. It was located 45.1 miles away. Tin Fire, which burned 37.00, started on July 26, 2026, and ended on July 27, 2026. It was located 23.4 miles away. Keller Fire, which burned 10.00, started on July 26, 2026, and ended on July 27, 2026. It was located 29.9 miles away. No prescribed fires were identified within 50 miles of Redlands - Dearborn.

In addition to reported prescribed fire and wildfire records from CAL FIRE and the Prescribed Fire Reporting System (PFIRS), satellite imagery detected 94 fire hotspots over the past two days (from two days before the event to the current day) within 100 miles of the site. This indicates ongoing fire activity in the region, which may have contributed to the observed air quality conditions. Satellite data confirms the presence of smoke plumes over the monitoring site, suggesting that emissions from nearby fires were transported into the area, potentially impacting ozone levels.

On July 27, 2026, an analysis was conducted to assess the potential impact of nearby fire activity on ozone levels at Glendora - Laurel. 6 wildfires were detected within 100 miles of the site from two days before the event to the event day. The proximity of these fires to the site suggests they may have contributed to elevated ozone levels on this date. The following wildfires were identified: Rider Fire, which burned 140.00, started on July 21, 2026, and last updated on July 26, 2026. It was located 40.2 miles away. Creelman Fire, which burned 347.00, started on July 22, 2026, and ended on July 25, 2026. It was located 97.1 miles away. Kirby Fire, which burned 46.00, started on July 23, 2026, and last updated on July 26, 2026. It was located 80.1 miles away. Tin Fire, which burned 37.00, started on July 26, 2026, and ended on July 27, 2026. It was located 30.3 miles away. Keller Fire, which burned 10.00, started on July 26, 2026, and ended on July 27, 2026. It was located 52.8 miles away. Fish Fire, which burned 4201.00, started on July 27, 2026, and last updated on July 29, 2026. It was located 92.6 miles away. No prescribed fires were identified within 50 miles of Glendora - Laurel.

In addition to reported prescribed fire and wildfire records from CAL FIRE and the Prescribed Fire Reporting System (PFIRS), satellite imagery detected 744 fire hotspots over the past two days (from two days before the event to the current day) within 100 miles of the site. This indicates ongoing fire activity in the region, which may have contributed to the observed air quality conditions. Satellite data confirms the presence of smoke plumes over the monitoring site, suggesting that emissions from nearby fires were transported into the area, potentially impacting ozone levels.

On July 27, 2026, an analysis was conducted to assess the potential impact of nearby fire activity on ozone levels at Santa Clarita. 4 wildfires were detected within 100 miles of the site from two days before the event to the event day. The proximity of these fires to the site suggests they may have contributed to elevated ozone levels on this date. The following wildfires were identified: Rider Fire, which burned 140.00, started on July 21, 2026, and last updated on July 26, 2026. It was located 82.0 miles away. Tin Fire, which burned 37.00, started on July 26, 2026, and ended on July 27, 2026. It was located 71.4 miles away. Keller Fire, which burned 10.00, started on July 26, 2026, and ended on July 27, 2026. It was located 93.6 miles away. Fish Fire, which burned 4201.00, started on July 27, 2026, and last updated on July 29, 2026. It was located 64.1 miles away. No prescribed fires were identified within 50 miles of Santa Clarita.

In addition to reported prescribed fire and wildfire records from CAL FIRE and the Prescribed Fire Reporting System (PFIRS), satellite imagery detected 752 fire hotspots over the past two days (from two days before the event to the current day) within 100 miles of the site. This indicates ongoing fire activity in the region, which may have contributed to the observed air quality conditions. Satellite data confirms the presence of smoke plumes over the monitoring site, suggesting that emissions from nearby fires were transported into the area, potentially impacting ozone levels.

On July 27, 2026, an analysis was conducted to assess the potential impact of nearby fire activity on ozone levels at Riverside - Rubidoux. 5 wildfires were detected within 100 miles of the site from two days before the event to the event day. The proximity of these fires to the site suggests they may have contributed to elevated ozone levels on this date. The following wildfires were identified: Rider Fire, which burned 140.00, started on July 21, 2026, and last updated on July 26, 2026. It was located 14.9 miles away. Creelman Fire, which burned 347.00, started on July 22, 2026, and ended on July 25, 2026. It was located 75.5 miles away. Kirby Fire, which burned 46.00, started on July 23, 2026, and last updated on July 26, 2026. It was located 53.7 miles away. Tin Fire, which burned 37.00, started on July 26, 2026, and ended on July 27, 2026. It was located 11.0 miles away. Keller Fire, which burned 10.00, started on July 26, 2026, and ended on July 27, 2026. It was located 29.3 miles away. No prescribed fires were identified within 50 miles of Riverside - Rubidoux.

In addition to reported prescribed fire and wildfire records from CAL FIRE and the Prescribed Fire Reporting System (PFIRS), satellite imagery detected 59 fire hotspots over the past two days (from two days before the event to the current day) within 100 miles of the site. This indicates ongoing fire activity in the region, which may have contributed to the observed air quality conditions. Satellite data confirms the presence of smoke plumes over the monitoring site, suggesting that emissions from nearby fires were transported into the area, potentially impacting ozone levels.

On July 27, 2026, an analysis was conducted to assess the potential impact of nearby fire activity on ozone levels at Mira Loma - Van Buren. 5 wildfires were detected within 100 miles of the site from two days before the event to the event day. The proximity of these fires to the site suggests they may have contributed to elevated ozone levels on this date. The following wildfires were identified: Rider Fire, which burned 140.00, started on July 21, 2026, and last updated on July 26, 2026. It was located 17.6 miles away. Creelman Fire, which burned 347.00, started on July 22, 2026, and ended on July 25, 2026. It was located 77.4 miles away. Kirby Fire, which burned 46.00, started on July 23, 2026, and last updated on July 26, 2026. It was located 57.3 miles away. Tin Fire, which burned 37.00, started on July 26, 2026, and ended on July 27, 2026. It was located 10.6 miles away. Keller Fire, which burned 10.00, started on July 26, 2026, and ended on July 27, 2026. It was located 31.5 miles away. No prescribed fires were identified within 50 miles of Mira Loma - Van Buren.

In addition to reported prescribed fire and wildfire records from CAL FIRE and the Prescribed Fire Reporting System (PFIRS), satellite imagery detected 59 fire hotspots over the past two days (from two days before the event to the current day) within 100 miles of the site. This indicates ongoing fire activity in the region, which may have contributed to the observed air quality conditions. Satellite data confirms the presence of smoke plumes over the monitoring site, suggesting that emissions from nearby fires were transported into the area, potentially impacting ozone levels.

On July 27, 2026, an analysis was conducted to assess the potential impact of nearby fire activity on ozone levels at Fontana - Arrow Highway. 5 wildfires were detected within 100 miles of the site from two days before the event to the event day. The proximity of these fires to the site suggests they may have contributed to elevated ozone levels on this date. The following wildfires were identified: Rider Fire, which burned 140.00, started on July 21, 2026, and last updated on July 26, 2026. It was located 23.1 miles away. Creelman Fire, which burned 347.00, started on July 22, 2026, and ended on July 25, 2026. It was located 83.7 miles away. Kirby Fire, which burned 46.00, started on July 23, 2026, and last updated on July 26, 2026. It was located 61.3 miles away. Tin Fire, which burned 37.00, started on July 26, 2026, and ended on July 27, 2026. It was located 17.7 miles away. Keller Fire, which burned 10.00, started on July 26, 2026, and ended on July 27, 2026. It was located 37.5 miles away. No prescribed fires were identified within 50 miles of Fontana - Arrow Highway.

In addition to reported prescribed fire and wildfire records from CAL FIRE and the Prescribed Fire Reporting System (PFIRS), satellite imagery detected 63 fire hotspots over the past two days (from two days before the event to the current day) within 100 miles of the site. This indicates ongoing fire activity in the region, which may have contributed to the observed air quality conditions. Satellite data confirms the presence of smoke plumes over the monitoring site, suggesting that emissions from nearby fires were transported into the area, potentially impacting ozone levels.

On July 27, 2026, an analysis was conducted to assess the potential impact of nearby fire activity on ozone levels at San Bernadino - 4th Street. 5 wildfires were detected within 100 miles of the site from two days before the event to the event day. The proximity of these fires to the site suggests they may have contributed to elevated ozone levels on this date. The following wildfires were identified: Rider Fire, which burned 140.00, started on July 21, 2026, and last updated on July 26, 2026. It was located 19.5 miles away. Creelman Fire, which burned 347.00, started on July 22, 2026, and ended on July 25, 2026. It was located 79.3 miles away. Kirby Fire, which burned 46.00, started on July 23, 2026, and last updated on July 26, 2026. It was located 52.4 miles away. Tin Fire, which burned 37.00, started on July 26, 2026, and ended on July 27, 2026. It was located 21.1 miles away. Keller Fire, which burned 10.00, started on July 26, 2026, and ended on July 27, 2026. It was located 33.7 miles away. No prescribed fires were identified within 50 miles of San Bernadino - 4th Street.

In addition to reported prescribed fire and wildfire records from CAL FIRE and the Prescribed Fire Reporting System (PFIRS), satellite imagery detected 59 fire hotspots over the past two days (from two days before the event to the current day) within 100 miles of the site. This indicates ongoing fire activity in the region, which may have contributed to the observed air quality conditions. Satellite data confirms the presence of smoke plumes over the monitoring site, suggesting that emissions from nearby fires were transported into the area, potentially impacting ozone levels.

On July 27, 2026, an analysis was conducted to assess the potential impact of nearby fire activity on ozone levels at Pasadena. 5 wildfires were detected within 100 miles of the site from two days before the event to the event day. The proximity of these fires to the site suggests they may have contributed to elevated ozone levels on this date. The following wildfires were identified: Rider Fire, which burned 140.00, started on July 21, 2026, and last updated on July 26, 2026. It was located 53.8 miles away. Kirby Fire, which burned 46.00, started on July 23, 2026, and last updated on July 26, 2026. It was located 93.8 miles away. Tin Fire, which burned 37.00, started on July 26, 2026, and ended on July 27, 2026. It was located 42.9 miles away. Keller Fire, which burned 10.00, started on July 26, 2026, and ended on July 27, 2026. It was located 65.0 miles away. Fish Fire, which burned 4201.00, started on July 27, 2026, and last updated on July 29, 2026. It was located 86.5 miles away. No prescribed fires were identified within 50 miles of Pasadena.

In addition to reported prescribed fire and wildfire records from CAL FIRE and the Prescribed Fire Reporting System (PFIRS), satellite imagery detected 744 fire hotspots over the past two days (from two days before the event to the current day) within 100 miles of the site. This indicates ongoing fire activity in the region, which may have contributed to the observed air quality conditions. Satellite data confirms the presence of smoke plumes over the monitoring site, suggesting that emissions from nearby fires were transported into the area, potentially impacting ozone levels.

On July 27, 2026, an analysis was conducted to assess the potential impact of nearby fire activity on ozone levels at Crestline - Lake Gregory. 5 wildfires were detected within 100 miles of the site from two days before the event to the event day. The proximity of these fires to the site suggests they may have contributed to elevated ozone levels on this date. The following wildfires were identified: Rider Fire, which burned 140.00, started on July 21, 2026, and last updated on July 26, 2026. It was located 28.9 miles away. Creelman Fire, which burned 347.00, started on July 22, 2026, and ended on July 25, 2026. It was located 88.3 miles away. Kirby Fire, which burned 46.00, started on July 23, 2026, and last updated on July 26, 2026. It was located 59.5 miles away. Tin Fire, which burned 37.00, started on July 26, 2026, and ended on July 27, 2026. It was located 29.6 miles away. Keller Fire, which burned 10.00, started on July 26, 2026, and ended on July 27, 2026. It was located 43.0 miles away. No prescribed fires were identified within 50 miles of Crestline - Lake Gregory.

In addition to reported prescribed fire and wildfire records from CAL FIRE and the Prescribed Fire Reporting System (PFIRS), satellite imagery detected 59 fire hotspots over the past two days (from two days before the event to the current day) within 100 miles of the site. This indicates ongoing fire activity in the region, which may have contributed to the observed air quality conditions. Satellite data confirms the presence of smoke plumes over the monitoring site, suggesting that emissions from nearby fires were transported into the area, potentially impacting ozone levels.

No wildfires were identified within 100 miles of Craters of the Moon NM. No prescribed fires were identified within 50 miles of Craters of the Moon NM.

While no prescribed fires or wildfires were recorded from CAL FIRE and the Prescribed Fire Reporting System (PFIRS),

On July 27, 2026, an analysis was conducted to assess the potential impact of nearby fire activity on ozone levels at Victorville - Park Avenue. 5 wildfires were detected within 100 miles of the site from two days before the event to the event day. The proximity of these fires to the site suggests they may have contributed to elevated ozone levels on this date. The following wildfires were identified: Rider Fire, which burned 140.00, started on July 21, 2026, and last updated on July 26, 2026. It was located 47.5 miles away. Kirby Fire, which burned 46.00, started on July 23, 2026, and last updated on July 26, 2026. It was located 76.6 miles away. Tin Fire, which burned 37.00, started on July 26, 2026, and ended on July 27, 2026. It was located 46.7 miles away. Keller Fire, which burned 10.00, started on July 26, 2026, and ended on July 27, 2026. It was located 61.7 miles away. Fish Fire, which burned 4201.00, started on July 27, 2026, and last updated on July 29, 2026. It was located 93.7 miles away. No prescribed fires were identified within 50 miles of Victorville - Park Avenue.

In addition to reported prescribed fire and wildfire records from CAL FIRE and the Prescribed Fire Reporting System (PFIRS), satellite imagery detected 716 fire hotspots over the past two days (from two days before the event to the current day) within 100 miles of the site. This indicates ongoing fire activity in the region, which may have contributed to the observed air quality conditions. Satellite data confirms the presence of smoke plumes over the monitoring site, suggesting that emissions from nearby fires were transported into the area, potentially impacting ozone levels.

On July 27, 2026, an analysis was conducted to assess the potential impact of nearby fire activity on ozone levels at Hesperia - Olive Street. 5 wildfires were detected within 100 miles of the site from two days before the event to the event day. The proximity of these fires to the site suggests they may have contributed to elevated ozone levels on this date. The following wildfires were identified: Rider Fire, which burned 140.00, started on July 21, 2026, and last updated on July 26, 2026. It was located 40.9 miles away. Kirby Fire, which burned 46.00, started on July 23, 2026, and last updated on July 26, 2026. It was located 69.8 miles away. Tin Fire, which burned 37.00, started on July 26, 2026, and ended on July 27, 2026. It was located 40.8 miles away. Keller Fire, which burned 10.00, started on July 26, 2026, and ended on July 27, 2026. It was located 54.9 miles away. Fish Fire, which burned 4201.00, started on July 27, 2026, and last updated on July 29, 2026. It was located 99.5 miles away. No prescribed fires were identified within 50 miles of Hesperia - Olive Street.

In addition to reported prescribed fire and wildfire records from CAL FIRE and the Prescribed Fire Reporting System (PFIRS), satellite imagery detected 659 fire hotspots over the past two days (from two days before the event to the current day) within 100 miles of the site. This indicates ongoing fire activity in the region, which may have contributed to the observed air quality conditions. Satellite data confirms the presence of smoke plumes over the monitoring site, suggesting that emissions from nearby fires were transported into the area, potentially impacting ozone levels.