Micrograms per cubic meter of PM2.5 to US AQI (EPA 2024)
Type a value in µg/m³ to get it in US AQI instantly.
56US 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: US 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 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 µg/m³ = 56 US AQI.
Every unit
That air in every scale
Tables
µg/m³ to US AQI conversion table
| µg/m³ | US AQI |
|---|---|
| 1 µg/m³ | 6 US AQI |
| 5 µg/m³ | 28 US AQI |
| 9 µg/m³ | 50 US AQI |
| 12 µg/m³ | 56 US AQI |
| 15 µg/m³ | 61 US AQI |
| 20 µg/m³ | 71 US AQI |
| 25 µg/m³ | 80 US AQI |
| 35 µg/m³ | 99 US AQI |
| 45 µg/m³ | 124 US AQI |
| 55 µg/m³ | 149 US AQI |
| 75 µg/m³ | 164 US AQI |
| 100 µg/m³ | 182 US AQI |
| 150 µg/m³ | 225 US AQI |
| 200 µg/m³ | 275 US AQI |
| 250 µg/m³ | 349 US AQI |
| 300 µg/m³ | 449 US AQI |
US AQI to µg/m³ conversion table
| US AQI | µg/m³ |
|---|---|
| 1 US AQI | 0.18 µg/m³ |
| 5 US AQI | 0.9 µg/m³ |
| 9 US AQI | 1.62 µg/m³ |
| 12 US AQI | 2.16 µg/m³ |
| 15 US AQI | 2.7 µg/m³ |
| 20 US AQI | 3.6 µg/m³ |
| 25 US AQI | 4.5 µg/m³ |
| 35 US AQI | 6.3 µg/m³ |
| 45 US AQI | 8.1 µg/m³ |
| 55 US AQI | 11.64 µg/m³ |
| 75 US AQI | 22.2 µg/m³ |
| 100 US AQI | 35.4 µg/m³ |
| 150 US AQI | 55.4 µg/m³ |
| 200 US AQI | 125.4 µg/m³ |
| 250 US AQI | 175.4 µg/m³ |
| 300 US AQI | 225.4 µg/m³ |
Quick answers
Quick answers
- How many US AQI is 1 µg/m³?
- 1 µg/m³ is 6 US AQI.
- How many US AQI is 10 µg/m³?
- 10 µg/m³ is 52 US AQI.
- How many US AQI is 12 µg/m³?
- 12 µg/m³ is 56 US AQI.
The units
About these units
Micrograms per cubic meter of PM2.5 (µg/m³)
The measured concentration of fine particles.
US AQI (EPA 2024) (US AQI)
The US Air Quality Index for PM2.5, with the 2024 breakpoints.
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