Air quality in Napa
The US Air Quality Index (EPA) grades air from 0 to 500 using fine particles (PM2.5/PM10), ozone and nitrogen dioxide. 0-50 is Good, 51-100 Moderate, 101-150 Unhealthy for Sensitive Groups, and anything higher affects everyone.
PM2.5
2 µg/m³
WHO guideline 15
PM10
2.2 µg/m³
WHO guideline 45
Hour by hour (12h) US EPA AQI
12:00 PM
💨
PM2.5 2 µg/m³
40 Good
1:00 PM
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PM2.5 2 µg/m³
41 Good
2:00 PM
💨
PM2.5 1.9 µg/m³
42 Good
3:00 PM
💨
PM2.5 1.9 µg/m³
43 Good
4:00 PM
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PM2.5 2.1 µg/m³
44 Good
5:00 PM
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PM2.5 2.4 µg/m³
43 Good
6:00 PM
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PM2.5 2.8 µg/m³
41 Good
7:00 PM
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PM2.5 3.6 µg/m³
36 Good
8:00 PM
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PM2.5 4.4 µg/m³
32 Good
9:00 PM
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PM2.5 4.8 µg/m³
29 Good
10:00 PM
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PM2.5 5 µg/m³
26 Good
11:00 PM
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PM2.5 5 µg/m³
23 Good
Next few days daily max · US EPA AQI
Tue
💨
Moderate · UV Moderate
55
Wed
💨
Moderate · UV Moderate
60
Thu
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Moderate · UV Moderate
61
Fri
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Moderate · UV Moderate
56
Sat
💨
Moderate · UV High
63
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Precip NEXRAD · NOAA Temp Wind Clouds Terrain