China AQI to US AQI (EPA 2024)
Type a value in CN AQI to get it in US AQI instantly.
47US AQI
That's 1.68× as polluted as the WHO yearly guideline, while the WHO daily guideline is 1.79× more polluted. On the US index that is AQI 47: good.
Convert the other way: US AQI to CN 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 CN AQI to US 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 CN AQI = 47 US AQI.
Every unit
That air in every scale
Tables
CN AQI to US AQI conversion table
| CN AQI | US AQI |
|---|---|
| 1 CN AQI | 4 US AQI |
| 5 CN AQI | 19 US AQI |
| 9 CN AQI | 35 US AQI |
| 12 CN AQI | 47 US AQI |
| 15 CN AQI | 53 US AQI |
| 20 CN AQI | 59 US AQI |
| 25 CN AQI | 66 US AQI |
| 35 CN AQI | 79 US AQI |
| 45 CN AQI | 93 US AQI |
| 55 CN AQI | 109 US AQI |
| 75 CN AQI | 149 US AQI |
| 100 CN AQI | 164 US AQI |
| 150 CN AQI | 193 US AQI |
| 200 CN AQI | 225 US AQI |
| 250 CN AQI | 275 US AQI |
| 300 CN AQI | 349 US AQI |
US AQI to CN AQI conversion table
| US AQI | CN AQI |
|---|---|
| 1 US AQI | 0 CN AQI |
| 5 US AQI | 1 CN AQI |
| 9 US AQI | 2 CN AQI |
| 12 US AQI | 3 CN AQI |
| 15 US AQI | 4 CN AQI |
| 20 US AQI | 5 CN AQI |
| 25 US AQI | 6 CN AQI |
| 35 US AQI | 9 CN AQI |
| 45 US AQI | 12 CN AQI |
| 55 US AQI | 17 CN AQI |
| 75 US AQI | 32 CN AQI |
| 100 US AQI | 51 CN AQI |
| 150 US AQI | 76 CN AQI |
| 200 US AQI | 165 CN AQI |
| 250 US AQI | 225 CN AQI |
| 300 US AQI | 275 CN AQI |
Quick answers
Quick answers
- How many US AQI is 1 CN AQI?
- 1 CN AQI is 4 US AQI.
- How many US AQI is 10 CN AQI?
- 10 CN AQI is 39 US AQI.
- How many US AQI is 12 CN AQI?
- 12 CN AQI is 47 US AQI.
The units
About these units
China AQI (CN AQI)
China’s index (HJ 633-2012), also used by many apps.
US AQI (EPA 2024) (US AQI)
The US Air Quality Index for PM2.5, with the 2024 breakpoints.
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