🌿 AQI Converter

Convert pollutant concentrations to air quality indices worldwide

35 PM2.5 µg/m³ ?

Your purifier shows a number. But what does it mean?

Devices like the Xiaomi Mi Air Purifier display raw PM2.5 concentrations in µg/m³. That number alone doesn't tell you if the air is safe.

Is 35 µg/m³ good or bad? It depends on where you are. The US EPA calls it "Good" (AQI 99), but China rates the same air "Excellent" (AQI 50). India? "Good" (AQI 58).

This tool converts raw concentrations into AQI values across 6 international scales, so you actually know what the number on your purifier means.

Pollutant & Concentration
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µg/m³
— US EPA Standard