PM2.5 Design Value Calculation using AirNow Data

This tool uses AirNow data to calculate an estimated Annual PM2.5 design value based on the selected AQS site and chosen year.

• Enter an AQS Site ID or click a site on the map to select it.
• Choose a base year for your design value.
• Set a PM2.5 threshold.
• Click the Submit button to see the estimated design value.

Note: The calculated design value is for reference purposes only and may not reflect the official EPA value.