convertimate Air quality (PM2.5 and AQI)

US AQI (EPA 2024) to micrograms per cubic meter of PM2.5

Type a value in US AQI to get it in µg/m³ instantly.

2.16µg/m³

Nothing on our list is smaller: the WHO yearly guideline is 2.3× more polluted. On the US index that is AQI 12: good.

Convert the other way: µg/m³ to US AQI

What it means

How dirty is that air?

For 24-hour averages of PM2.5 only. Official AQI values take the worst of several pollutants; hourly readings shown by apps are estimates.

The math

How to convert US AQI to µg/m³

The AQI is piecewise linear between breakpoints: 9 µg/m³ = AQI 50, 35.4 = 100, 55.4 = 150, 125.4 = 200, 225.4 = 300 (US EPA, 2024).

Example: 12 US AQI = 2.16 µg/m³.

Every unit

That air in every scale

Tables

US AQI to µg/m³ conversion table

US AQI to µg/m³ conversion table
US AQIµg/m³
1 US AQI0.18 µg/m³
5 US AQI0.9 µg/m³
9 US AQI1.62 µg/m³
12 US AQI2.16 µg/m³
15 US AQI2.7 µg/m³
20 US AQI3.6 µg/m³
25 US AQI4.5 µg/m³
35 US AQI6.3 µg/m³
45 US AQI8.1 µg/m³
55 US AQI11.64 µg/m³
75 US AQI22.2 µg/m³
100 US AQI35.4 µg/m³
150 US AQI55.4 µg/m³
200 US AQI125.4 µg/m³
250 US AQI175.4 µg/m³
300 US AQI225.4 µg/m³
µg/m³ to US AQI conversion table
µg/m³ to US AQI conversion table
µg/m³US AQI
1 µg/m³6 US AQI
5 µg/m³28 US AQI
9 µg/m³50 US AQI
12 µg/m³56 US AQI
15 µg/m³61 US AQI
20 µg/m³71 US AQI
25 µg/m³80 US AQI
35 µg/m³99 US AQI
45 µg/m³124 US AQI
55 µg/m³149 US AQI
75 µg/m³164 US AQI
100 µg/m³182 US AQI
150 µg/m³225 US AQI
200 µg/m³275 US AQI
250 µg/m³349 US AQI
300 µg/m³449 US AQI

Quick answers

Quick answers

How many µg/m³ is 1 US AQI?
1 US AQI is 0.18 µg/m³.
How many µg/m³ is 10 US AQI?
10 US AQI is 1.8 µg/m³.
How many µg/m³ is 12 US AQI?
12 US AQI is 2.16 µg/m³.

The units

About these units

US AQI (EPA 2024) (US AQI)

The US Air Quality Index for PM2.5, with the 2024 breakpoints.

Micrograms per cubic meter of PM2.5 (µg/m³)

The measured concentration of fine particles.

Learn more about air pollution units

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