SmogRank / History / week of February 6, 2023

Most polluted cities, week of February 6, 2023

1 cities ranked by their average PM2.5 over the 7 days; the worst was Nairobi, Kenya, at 22.5 µg/m³. A city needs measurements on 70% of the days to be ranked.

  1. 1NairobiNairobi County, Kenya
    22.5
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+