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Global AQI Comparison Calculator

Compare the same air pollutant concentrations under major international air-quality systems.

India · USA · China · UK · Europe · WHO Guidelines

Simple Mode is designed for quick comparison using commonly available daily and 8-hour measurements.

Switch to Advanced Exact Mode if you also have the specific hourly, 15-minute, ppm or ppb measurements required by individual international systems.
Pollutant Concentrations

Leave any pollutant blank if you do not have a measured value.

UK DAQI – Exact Additional Inputs

PM values and O₃ above already match UK averaging periods. Add these gases for a more complete UK DAQI.

US EPA – Exact Gas Inputs

PM2.5 and PM10 above are used directly. EPA gaseous-pollutant inputs use ppm or ppb.

China & WHO – CO 24-Hour
European Air Quality Index – Hourly Inputs

The EEA European Air Quality Index is an hourly index, so exact calculation requires hourly concentrations.

International Air Quality Comparison
Each system is calculated independently using compatible measurements.
Important: AQI values from different countries are not interchangeable. A partial result means the calculator used only pollutants for which measurements with the correct averaging period and units were supplied.

International AQI Calculator: Air-quality indices differ between countries because each system uses its own pollutant breakpoints, averaging periods, units and health categories. This calculator compares the applicable systems without converting one country’s AQI number into another.

Reference frameworks: India National AQI; US EPA AQI; China HJ 633—2026; UK Daily Air Quality Index; European Environment Agency Air Quality Index; and WHO 2021 Global Air Quality Guidelines. WHO results are guideline comparisons and are not a WHO AQI.