Conversion from ppb to µg/m3 is calculated with the following formula:
µg/m3 = ppb * conversion_factor
| Gas | Conversion factor |
|---|---|
| NO2 | 1.912 |
| SO2 | 2.66 |
| CO | 1.16 |
| H2S | 1.417 |
| O3 | 2.00 |
| NO | 1.247 |
The conversion assumes a temperature of +20 °C (+68 °F) (European standard).