Air Quality · UV · Pollen

Air quality in City and County of San Francisco

California, United States · October 25 2026

2/6

Moderate

Air Quality · US EPA

2/6

Moderate

UV Index · max

3.9

Moderate

Pollen · dominant

Low

Ragweed

Air quality breakdown Moderate

US EPA 2/6 · UK DEFRA 2/10 · µg/m³.

PM2.5 16 µg/m³

PM10 19 µg/m³

O3 35 µg/m³

NO2 32 µg/m³

SO2 1.6 µg/m³

CO 203 µg/m³

Acceptable for most; unusually sensitive people should watch for symptoms.

Today's maximum UV is 3.9, now 0.

036811+

Seek shade near midday; sunscreen and a hat recommended.

Dominant allergen: Ragweed · 3 grains/m³.

Trees

no data

None

Grass

no data

None

Weeds

Ragweed · 3

Low

Low to moderate pollen - most people are unaffected; the highly sensitive may notice mild symptoms.