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St. Helena

Napa County, California

2026-04-29 12:00
CAQI (Europe)
Very Low
Pollutants|Pollens
O3
μg/m³
47.6
PM10
μg/m³
10.1
PM2.5
μg/m³
2.6
CO
μg/m³
183.3
NO2
μg/m³
0.9
Weather
  • ℃
  • ℉
9℃
74%
6 kph
0 of 11
Historical Data
  • Hourly
  • Daily
  • CAQI (Europe)
  • Pollen
  • O3
  • PM10
  • PM2.5
  • CO
  • NO2

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