SmogRank / History / February 2023
Most polluted cities, February 2023
1 cities ranked by their average PM2.5 over the 28 days. A city needs measurements on 70% of the days to be ranked.
| # | City | µg/m³ | |
|---|---|---|---|
| 1 | Nairobi Nairobi County, Kenya | 21.7 |
Good 0–9.0Moderate 9.1+Unhealthy for sensitive groups 35.5+Unhealthy 55.5+Very unhealthy 125.5+Hazardous 225.5+No data