Air Quality Index Calculator

Calculate Air Quality Index (AQI) from pollutant concentrations with instant results and health recommendations.

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About This Tool

This AQI Calculator computes the Air Quality Index based on concentrations of six major pollutants: PM2.5, PM10, Ozone (O3), Nitrogen Dioxide (NO2), Sulfur Dioxide (SO2), and Carbon Monoxide (CO). Enter pollutant values in appropriate units (μg/m³ for particles, ppb for gases, ppm for CO) to get the overall AQI score, primary pollutant, and health recommendations. The tool uses the US EPA AQI calculation methodology with color-coded categories from Good to Hazardous.

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How to Use

Enter concentrations for available pollutants (leave blank for pollutants you don't have data for)
Click 'Calculate AQI' button
View the calculated AQI score, category, primary pollutant, and health recommendations
The tool automatically validates inputs and shows errors for invalid values

Frequently Asked Questions

Find Quick Answers

What pollutants does this AQI calculator support?

The calculator supports PM2.5, PM10, Ozone (O3), Nitrogen Dioxide (NO2), Sulfur Dioxide (SO2), and Carbon Monoxide (CO) - the six major pollutants used in standard AQI calculations.

What units should I use for pollutant concentrations?

Use μg/m³ for PM2.5 and PM10, ppb (parts per billion) for O3, NO2, and SO2, and ppm (parts per million) for CO. The tool validates that values are within reasonable ranges.

How is the AQI calculated?

The tool uses the US EPA's AQI calculation methodology: it computes individual AQI values for each pollutant using breakpoint tables, then selects the highest value as the overall AQI. The corresponding pollutant becomes the primary pollutant.

What do the AQI categories mean?

AQI categories range from Good (0-50) to Hazardous (301-500). Each category has specific color coding and health recommendations for sensitive groups and the general population.

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