Lima Air Quality Guide - Sources, Seasons, and Health Implications

A guide to air quality in Lima, Peru - sources, seasonal patterns, health implications, and how to track conditions in real time.

Air quality overview

Lima is a city of approximately 10,750,000 residents in Peru. Based on multi-year averages, its air quality runs moderate, with seasonal swings into unhealthy ranges.

See live readings: Lima live AQI →

What drives air pollution in Lima

The dominant pollution sources affecting Peru cities like Lima are:

• vehicle emissions in dense urban zones
• Amazon and Cerrado biomass burning (dry season)
• industrial activity in port cities
• diesel public transit fleets
• winter wood-burning in southern cities (Chile, Argentina)

Seasonal pattern

Dry season (August-October) brings continental-scale smoke from forest and agricultural fires. Winter inversions affect cities like Santiago and Bogotá.

Geography and meteorology

Lima sits at approximately -12.05° latitude, -77.04° longitude. Andean valley cities face severe inversion problems; coastal cities are typically cleaner. Amazon basin has very clean air outside of fire season.

Health implications

Sensitive groups should monitor daily readings. Plan outdoor activity for cleaner-air windows. The most-studied pollutant for population health is fine particulate matter (PM2.5). Exposure is linked to cardiovascular disease, respiratory illness, and increased mortality. Children, the elderly, and people with respiratory or cardiac conditions face elevated risk.

Other pollutants commonly elevated in urban areas:

• Ozone (O3) - peaks on hot, sunny afternoons
• Nitrogen dioxide (NO2) - traffic-correlated, peaks at rush hours
• PM10 - includes road dust and coarse particles

Policy and trajectory

Brazil's INPE monitors fires; deforestation rates strongly correlate with pollution events across the continent. Chile has introduced restrictions on wood-stove use in southern cities.

Practical guidance for residents and visitors

1. Check the AQI before outdoor exercise. If readings exceed 100, sensitive groups should reduce intensity. Above 150, everyone should consider shifting indoors.
2. Wear an N95 or KN95 during peaks. Cloth masks do not filter PM2.5.
3. Run a HEPA air purifier in bedrooms. Indoor levels typically track 50-70% of outdoor levels in unfiltered homes - see our air purifier buyer's guide.
4. Use mechanical ventilation with HEPA filtration when AQI is high; avoid simply opening windows.
5. Subscribe to free email alerts for Lima - we email when AQI crosses your threshold: set up alerts →

How we track Lima

Live readings refresh every 30 minutes via atmos.today. See methodology and attribution for data sources.

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Live Lima air quality: /peru/lima. Methodology: /about. Reviewed: May 2, 2026.