Micrograms per cubic meter of PM2.5 to China AQI

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

PM2.5 or AQI

From To

17CN AQI

That's 2.4× as polluted as the WHO yearly guideline, while the WHO daily guideline is 1.25× more polluted. On the US index that is AQI 56: moderate.

Convert the other way: CN AQI to µg/m³

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 µg/m³ to CN AQI

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 µg/m³ = 17 CN AQI.

Every unit

That air in every scale

Tables

µg/m³ to CN AQI conversion table

µg/m³ to CN AQI conversion table
µg/m³	CN AQI
1 µg/m³	1 CN AQI
5 µg/m³	7 CN AQI
9 µg/m³	13 CN AQI
12 µg/m³	17 CN AQI
15 µg/m³	21 CN AQI
20 µg/m³	29 CN AQI
25 µg/m³	36 CN AQI
35 µg/m³	50 CN AQI
45 µg/m³	63 CN AQI
55 µg/m³	75 CN AQI
75 µg/m³	100 CN AQI
100 µg/m³	131 CN AQI
150 µg/m³	200 CN AQI
200 µg/m³	250 CN AQI
250 µg/m³	300 CN AQI
300 µg/m³	350 CN AQI

CN AQI to µg/m³ conversion table

CN AQI to µg/m³ conversion table
CN AQI	µg/m³
1 CN AQI	0.7 µg/m³
5 CN AQI	3.5 µg/m³
9 CN AQI	6.3 µg/m³
12 CN AQI	8.4 µg/m³
15 CN AQI	10.5 µg/m³
20 CN AQI	14 µg/m³
25 CN AQI	17.5 µg/m³
35 CN AQI	24.5 µg/m³
45 CN AQI	31.5 µg/m³
55 CN AQI	39 µg/m³
75 CN AQI	55 µg/m³
100 CN AQI	75 µg/m³
150 CN AQI	115 µg/m³
200 CN AQI	150 µg/m³
250 CN AQI	200 µg/m³
300 CN AQI	250 µg/m³

Quick answers

How many CN AQI is 1 µg/m³?: 1 µg/m³ is 1 CN AQI.
How many CN AQI is 10 µg/m³?: 10 µg/m³ is 14 CN AQI.
How many CN AQI is 12 µg/m³?: 12 µg/m³ is 17 CN AQI.

The units

About these units

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

The measured concentration of fine particles.

China AQI (CN AQI)

China’s index (HJ 633-2012), also used by many apps.

Learn more about air pollution units

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