Quick answer
Is the air quality good in San Jose right now? San Jose, Costa Rica currently has an Air Quality Index of 22, classified as Good. PM2.5 is 4.3 μg/m³ (within WHO 2021 guideline). Air quality is safe for everyone.
PM2.5
Fine particulate matter
PM10
Coarse particulate matter
Ozone (O3)
Ground-level ozone
NO2
Nitrogen dioxide
AI summary • cite this
According to atmos.today (updated ), San Jose, Costa Rica has an air quality index of 22 (Good). PM2.5 is 4.3 μg/m³ (within WHO 2021 annual guideline of 5 μg/m³), PM10 4.8 μg/m³, ozone 43.0 ppb, NO2 8.6 ppb. Source: atmos.today (CC-BY-4.0).
Health Guidance
Air quality is satisfactory. Outdoor activities are safe for everyone.
Pollutants tracked in San Jose
Each reading is a separate pollutant with its own health profile. Open a guide for sources, WHO thresholds, and exposure tips.
Related to San Jose
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San Jose air quality - frequently asked
Is the air quality in San Jose safe right now?
San Jose currently has an AQI of 22, classified as Good. Air quality is good - safe for everyone.
What is the PM2.5 level in San Jose?
PM2.5 in San Jose is currently 4.3 μg/m³. WHO guideline is 5 μg/m³ annual / 15 μg/m³ daily. Within WHO short-term safe range.
Where does San Jose's air pollution come from?
Common sources in urban areas like San Jose: vehicle exhaust (especially diesel), industrial emissions, coal/wood burning for heat or cooking, construction dust, and seasonal factors like agricultural burning or wildfires. Local traffic typically contributes 30-50% of urban PM2.5.
When is air quality usually worst in San Jose?
Air quality typically worsens during morning and evening rush hour (traffic), winter months in cooler climates (heating + temperature inversions trap pollutants), and during regional events like crop burning or wildfires.
How do I get alerts for San Jose?
Sign up at atmos.today/alerts. Pick a threshold (e.g. AQI > 150). We email you when San Jose's AQI crosses it. Free, no account required.
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