AddAir quality in San Mateo
Air quality index (AQI⁺) and PM2.5 air pollution in San Mateo • 00:00, May 15 Local time
165*
US AQI⁺Unhealthy
Main pollutant:
PM2.5
75 µg/m³
26°
5 km/h
75 %
Hourly forecast
San Mateo air quality index (AQI⁺) forecast
Daily forecast
San Mateo air quality index (AQI⁺) forecast
| Today | 135 |  | 36° 27° |  19 km/h | 57% |
| Sat | 61 |  | 35° 26° | 16 km/h | 57% |
| Sun | 65 | | 35° 26° | 21 km/h | 55% |
Air pollutants
What is the current air quality in San Mateo?
PM2.5 concentration is currently 15 times the World Health Organization annual PM2.5 guideline value.
Health recommendations
 Avoid outdoor exercise |
 Close your windows to avoid dirty outdoor air Get a monitor |
 Wear a mask outdoors Get a mask |
 Run an air purifier Get an air purifier |
Protect yourself from air pollution in San Mateo
Monitor the air you breathe
Get accurate AirVisual air quality readings and real-time insights for cleaner air. Monitors that reveal pollution sources, highlight when air purifier use is needed.
Medical grade air purifiers
Trusted worldwide, the HealthPro Series uses HyperHEPA technology. Filters ultrafine particles other air purifiers miss, delivering medical-grade protection.
Powerful, stylish air purifiers
Compact and powerful, the Atem Series combines Swiss engineering with high-performance air purification, filtering ultrafine particles with HyperHEPA technology.
Health recommendations
Avoid outdoor exercise |
Close your windows to avoid dirty outdoor air Get a monitor |
Wear a mask outdoors Get a mask |
Run an air purifier Get an air purifier |
Protect yourself from air pollution in San Mateo
Monitor the air you breathe
Get accurate AirVisual air quality readings and real-time insights for cleaner air. Monitors that reveal pollution sources, highlight when air purifier use is needed.
Medical grade air purifiers
Trusted worldwide, the HealthPro Series uses HyperHEPA technology. Filters ultrafine particles other air purifiers miss, delivering medical-grade protection.
Powerful, stylish air purifiers
Compact and powerful, the Atem Series combines Swiss engineering with high-performance air purification, filtering ultrafine particles with HyperHEPA technology.
Most polluted locations near San Mateo
Worldwide AQI⁺ ranking
Historic air quality near San Mateo
History
Historic air quality graph for San Mateo
Historic air quality near San Mateo
History
Historic air quality graph for San Mateo
Most polluted locations near San Mateo
Worldwide AQI⁺ ranking
