Most polluted cities in Kenya

0 measured cities, last 24 hours.

Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city, or a region to zoom in.

No city has enough measurements for this window yet.

Low risk1–3

Moderate risk4–6

High risk7–10

Very high risk10+

Canada's AQHI+ for PM2.5 (1 point per 10 µg/m³), which is defined on hourly values. Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

Estimated: cities without a monitor

Kenya cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.

City	7-day estimate	Band
Nairobi	≈ 8 µg/m³	Low risk
Kakamega	≈ 22 µg/m³	Low risk
Mombasa	≈ 7 µg/m³	Low risk
Nakuru	≈ 7 µg/m³	Low risk
Ruiru	≈ 8 µg/m³	Low risk
Eldoret	≈ 12 µg/m³	Low risk
Kisumu	≈ 23 µg/m³	Low risk
Kikuyu	≈ 8 µg/m³	Low risk
Thika	≈ 5 µg/m³	Low risk
Naivasha	≈ 9 µg/m³	Low risk
Karuri	≈ 8 µg/m³	Low risk
Karuri	≈ 9 µg/m³	Low risk
Matuga	≈ 7 µg/m³	Low risk
Mwala	≈ 4 µg/m³	Low risk
Ongata Rongai	≈ 8 µg/m³	Low risk
Jomvu	≈ 7 µg/m³	Low risk
Garissa	≈ 4 µg/m³	Low risk
Kitale	≈ 7 µg/m³	Low risk
Limuru	≈ 8 µg/m³	Low risk
Juja	≈ 5 µg/m³	Low risk
Kitengela	≈ 3 µg/m³	Low risk
Kiambu	≈ 8 µg/m³	Low risk
Mlolongo	≈ 8 µg/m³	Low risk
Malindi	≈ 7 µg/m³	Low risk
Mandera	≈ 4 µg/m³	Low risk
Khwisero	≈ 23 µg/m³	Low risk
Kisii	≈ 13 µg/m³	Low risk
Ngong	≈ 8 µg/m³	Low risk
Mtwapa	≈ 7 µg/m³	Low risk
Wajir	≈ 3 µg/m³	Low risk
Lodwar	≈ 2 µg/m³	Low risk
Athi River	≈ 3 µg/m³	Low risk
Meru	≈ 5 µg/m³	Low risk
Nyeri	≈ 9 µg/m³	Low risk
Isiolo	≈ 5 µg/m³	Low risk
Ukunda	≈ 7 µg/m³	Low risk
Kiserian	≈ 3 µg/m³	Low risk
Kilifi	≈ 8 µg/m³	Low risk
Nanyuki	≈ 4 µg/m³	Low risk
Busia	≈ 22 µg/m³	Low risk

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SmogRank, most polluted cities in Kenya, PM2.5, last 24 hours to 2 Oct 2026, 04:00 UTC, smogrank.com/ke.

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Updated 2026-10-02 04:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the Canada AQHI+ PM2.5 sub-index.