Los Angeles Air Quality in 2024: Pollution Patterns
How air quality behaves in Los Angeles: the latest measured AQI, which pollutants dominate, seasonal patterns, and the local drivers of pollution.
Current Air Quality
Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution.
Extra Protection for Los Angeles Homes
Air quality in Los Angeles is moderate (AQI 56), with fine particles (PM2.5) the main concern. A True-HEPA purifier gives sensitive groups — kids, seniors and anyone with asthma or allergies — cleaner air indoors on days like today.
Recommended: Levoit Vital 200S — True HEPA · washable pre-filter · rooms up to 1,875 sq ft
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Los Angeles Air Quality in 2024
This page covers what shapes air quality in Los Angeles over the course of a year: the pollutants that dominate locally, how conditions typically shift between seasons, and the local emission sources behind them. Measured 2024 annual statistics are published by EPA's Air Quality System, not here, so the AQI figure below is the latest observation available when this page was published.
View Current Los Angeles Air Quality →Latest Measured Reading for Los Angeles
The most recent EPA AirNow observation for the Central LA CO reporting area puts Los Angeles's AQI at 56 (Moderate), with fine particulate matter (PM2.5) as the dominant pollutant — typical for the West Coast region. Observed 3:00 AM PDT on August 9, 2026. Reported by South Coast AQMD.
This is a single observation captured when the page was published, not a 2024 average. For measured annual and monthly statistics, use the EPA's Air Quality System reports.
How Los Angeles Air Quality Shifts Through the Year
Mar–May: Usually Los Angeles's cleanest stretch. Mild temperatures and better atmospheric mixing keep both ozone and particulates down.
Jun–Aug: Heat and sunlight drive higher ozone and, in the West, wildfire-smoke episodes. Afternoons are typically the worst time to be outside.
Sep–Nov: Air quality generally improves as temperatures drop, though early fall can still carry wildfire smoke in the West Coast region.
Dec–Feb: Cold-air temperature inversions can trap PM2.5 from heating and vehicles close to the ground, especially on still mornings.
Seasonal patterns above describe how pollution typically behaves in this region. They are not measured 2024 averages for Los Angeles.
Is It Safe to Exercise Outside in Los Angeles?
With Los Angeles's AQI at 56 (Moderate), outdoor exercise is generally safe for most people. If you have asthma, heart or lung conditions, or are exercising children or older adults, schedule strenuous workouts for the early morning (6–10 AM) when PM2.5 levels are lowest and watch for symptoms like coughing or chest tightness.
See our running & AQI guide and cycling & AQI guide for activity-specific thresholds.
What's Causing Los Angeles's Air Pollution?
In Los Angeles, the leading pollutant is fine particulate matter (PM2.5). As part of the West Coast region, the main drivers of air pollution here are:
- •Vehicle emissions from heavily trafficked freeways and urban corridors
- •Seasonal wildfire smoke drifting in from forest fires across the West
- •Port, shipping, and warehouse logistics activity
- •Agricultural operations and dust in nearby valleys
Dig deeper: Los Angeles PM2.5 levels · Los Angeles ozone levels
Air Purifier & Monitor Buying Guides
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PM2.5 Levels
Fine particulate matter data →
Ozone Levels
Ground-level ozone data →
Seasonal Guides
Air quality by season →
Health Effects
Learn about air pollution impacts →
Frequently Asked Questions About Los Angeles Air Quality
What is the current air quality in Los Angeles?
The current Air Quality Index (AQI) in Los Angeles, CA is 56, which is considered moderate.
Is it safe to exercise outdoors in Los Angeles?
Generally yes. With an AQI of 56, outdoor exercise is acceptable for most people. Sensitive individuals should monitor symptoms.
When is the best time of year to visit Los Angeles for good air quality?
Spring and early fall typically offer the best air quality in Los Angeles. Summer months may have elevated ozone levels, while winter can see higher PM2.5 from temperature inversions.
What causes air pollution in Los Angeles?
Air pollution in Los Angeles can come from vehicle emissions, industrial activity, construction, wildfires, and weather patterns. Local geography and seasonal factors also play a significant role.
Explore More Air Quality Data
Extra Protection for Los Angeles Homes
Air quality in Los Angeles is moderate (AQI 56), with fine particles (PM2.5) the main concern. A True-HEPA purifier gives sensitive groups — kids, seniors and anyone with asthma or allergies — cleaner air indoors on days like today.
Compare top-rated True-HEPA purifiers:
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