SmogRank / World / South America / Peru / Lima region

Most polluted cities in Lima region, Peru

4 measured cities, this year; 4 above the WHO annual guideline. Worst: Santa María at 36.4 µg/m³, #106 in the world.

About 38.7K people in these 2 cities breathed unhealthy air on an average day so far this year.

Ranked by people: each city's population times its share of unhealthy days, those with a daily mean over 35.4 µg/m³ (US AQI 101+). That is how many people living there breathed unhealthy air on an average day. Only cities measured at 2 or more places at least 3 km apart are ranked: one monitor shouldn't speak for a whole city. Population is the city itself, not its wider metro area.

Huánuco DepartmentIcaJuninLima region: 4 measured citiesPascoUcayaliCallao: 1 measured cityAncashAyacuchoHuancavelica#4 Villa Poeta José Gálvez Barrenechea: 12.8 µg/m³#3 San Francisco De Borja: 21.8 µg/m³#2 Santa Anita - Los Ficus: 26.5 µg/m³#1 Santa María: 36.4 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
  1. 1Santa Anita - Los Ficuslast full day 3 Oct 32.6K
  2. 2San Francisco De Borjalast full day 3 Oct 6.09K
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). 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

Lima region 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.

City7-day estimateBand
Chosica≈ 26 µg/m³Moderate
Breña≈ 13 µg/m³Moderate
San Isidro≈ 13 µg/m³Moderate
Jesus Maria≈ 13 µg/m³Moderate
Huaral≈ 19 µg/m³Moderate
Huacho≈ 10 µg/m³Moderate
Barranca≈ 11 µg/m³Moderate
Nuevo Imperial≈ 9 µg/m³Good
Imperial≈ 9 µg/m³Good
Paramonga≈ 10 µg/m³Moderate
Chancay≈ 19 µg/m³Moderate
Hualmay≈ 10 µg/m³Moderate
San Vicente de Cañete≈ 9 µg/m³Good
Huaura≈ 10 µg/m³Moderate
Mala≈ 9 µg/m³Good

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SmogRank, most polluted cities in Lima region, Peru, PM2.5, this year to 6 Oct 2026, 22:00 UTC, smogrank.com/pe/region/lima-region?w=year.

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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.

Updated 2026-10-06 22:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.