Acceptable air. Very sensitive people should take care during prolonged outdoor exertion.
PM2.5
Fine particulate matter — the key air-pollution indicator.
PM10
Coarse dust and airborne particles.
Air quality FAQ ❓
What is the air quality in San-Frantsisko now?
The US AQI is 51 — “moderate”. Acceptable air. Very sensitive people should take care during prolonged outdoor exertion.
What are PM2.5 and PM10?
These are concentrations of particles up to 2.5 and 10 microns. The smaller the particles, the deeper they penetrate the airways.
Air quality in San-Frantsisko
Air quality index in San-Frantsisko (US AQI), PM2.5 and PM10 particle concentrations from Open-Meteo Air Quality. The index shows how safe the air is for walks and ventilation; high values are dangerous for allergy sufferers, children, the elderly and people with respiratory conditions. Data updates several times a day.