Air Quality Forecast Guidance for Napa, CA

Displayed below are NOAA-EPA Air Quality Forecast Guidance values for
latitude: 38.27 N, longitude: 122.30 W.
Ozone concentrations are presented in parts per billion (PPB).
Public comments and suggestions are encouraged.

A FAQ page is available.
More information...
24Hr Maximum
Ending
Maximum 1 Hour Average Ozone
Concentration (PPB)*
Maximum 8 Hour Average Ozone
Concentration (PPB)*
Tomorrow
(Ending 09/21, 4Z)
50
47
*Due to grid interpolation methods, the maximum 1- and 8-hour ozone concentration values may have
values slightly higher or lower than those of the corresponding hourly ozone concentrations.

Ozone
Ending Time
1 Hour Average Ozone
Concentration (PPB)

12Z Model Run
8 Hour Average Ozone
Concentration (PPB)

12Z Model Run
Mon, 20 Sep  10 PM
34
43
Mon, 20 Sep  11 PM
33
41
Tue, 21 Sep  12 AM
31
39
Tue, 21 Sep  01 AM
30
37
Tue, 21 Sep  02 AM
29
34
Tue, 21 Sep  03 AM
29
32
Tue, 21 Sep  04 AM
14
29
Tue, 21 Sep  05 AM
28
29
Tue, 21 Sep  06 AM
26
28
Tue, 21 Sep  07 AM
21
26
Tue, 21 Sep  08 AM
18
25
Tue, 21 Sep  09 AM
27
24
Tue, 21 Sep  10 AM
39
25
Tue, 21 Sep  11 AM
47
28
Tue, 21 Sep  12 PM
54
33
Tue, 21 Sep  01 PM
57
36
Tue, 21 Sep  02 PM
59
40
Tue, 21 Sep  03 PM
62
45
Tue, 21 Sep  04 PM
64
51
Tue, 21 Sep   05 PM
66
56
Tue, 21 Sep   06 PM
67
60
Tue, 21 Sep   07 PM
62
61
Tue, 21 Sep   08 PM
51
61
Tue, 21 Sep   09 PM
46
60
Tue, 21 Sep   10 PM
43
58
Tue, 21 Sep   11 PM
40
55
Wed, 22 Sep   12 AM
39
52
Wed, 22 Sep   01 AM
38
48
Wed, 22 Sep   02 AM
35
44
Smoke
Ending Time
(Local Time)
1 Hour Surface Smoke (µg/m³)
06Z Model Run
1 Hour Column-Integrated
Smoke (µg/m³)

06Z Model Run
Mon, 20 Sep  10 PM
4
0
Mon, 20 Sep  11 PM
3
1
Tue, 21 Sep  12 AM
6
1
Tue, 21 Sep  01 AM
4
1
Tue, 21 Sep  02 AM
3
1
Tue, 21 Sep  03 AM
0
1
Tue, 21 Sep  04 AM
6
1
Tue, 21 Sep  05 AM
7
1
Tue, 21 Sep  06 AM
4
1
Tue, 21 Sep  07 AM
3
1
Tue, 21 Sep  08 AM
5
1
Tue, 21 Sep  09 AM
2
6
Tue, 21 Sep  10 AM
2
5
Tue, 21 Sep  11 AM
2
7
Tue, 21 Sep  12 PM
2
7
Tue, 21 Sep  01 PM
2
9
Tue, 21 Sep  02 PM
6
8
Tue, 21 Sep  03 PM
9
7
Tue, 21 Sep  04 PM
2
12
Tue, 21 Sep  05 PM
0
8
Tue, 21 Sep  06 PM
1
6
Tue, 21 Sep  07 PM
2
5
Tue, 21 Sep  08 PM
2
7
Tue, 21 Sep  09 PM
1
8
Tue, 21 Sep  10 PM
5
8

National Weather Service Air Quality Program Page
Environmental Protection Agency AirNow Forecast Page
Graphical Air Quality Forecast Guidance
FAQ


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