Air Quality Forecast Guidance

Displayed below are NOAA-EPA Air Quality Forecast Guidance values for
latitude: 47.40 N, longitude: 121.39 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 05/28, 4Z)
42
37
*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
Sun, 28 May  02 AM
17
32
Sun, 28 May  03 AM
15
29
Sun, 28 May  04 AM
17
26
Sun, 28 May  05 AM
14
23
Sun, 28 May  06 AM
14
19
Sun, 28 May  07 AM
17
18
Sun, 28 May  08 AM
19
17
Sun, 28 May  09 AM
22
17
Sun, 28 May  10 AM
26
18
Sun, 28 May  11 AM
28
20
Sun, 28 May  12 PM
30
21
Sun, 28 May  01 PM
30
23
Sun, 28 May  02 PM
30
25
Sun, 28 May  03 PM
31
27
Sun, 28 May  04 PM
33
29
Sun, 28 May   05 PM
35
30
Sun, 28 May   06 PM
39
32
Sun, 28 May   07 PM
43
34
Sun, 28 May   08 PM
48
36
Sun, 28 May   09 PM
47
38
Sun, 28 May   10 PM
43
40
Sun, 28 May   11 PM
38
41
Mon, 29 May   12 AM
34
41
Mon, 29 May   01 AM
32
40
Mon, 29 May   02 AM
30
39
Smoke
Ending Time
(Local Time)
1 Hour Surface Smoke (µg/m³)
06Z Model Run
1 Hour Column-Integrated
Smoke (µg/m³)

06Z Model Run
Sun, 28 May  02 AM
0
0
Sun, 28 May  03 AM
0
0
Sun, 28 May  04 AM
0
0
Sun, 28 May  05 AM
0
0
Sun, 28 May  06 AM
0
0
Sun, 28 May  07 AM
0
0
Sun, 28 May  08 AM
0
0
Sun, 28 May  09 AM
0
0
Sun, 28 May  10 AM
0
0
Sun, 28 May  11 AM
0
0
Sun, 28 May  12 PM
0
0
Sun, 28 May  01 PM
0
0
Sun, 28 May  02 PM
0
0
Sun, 28 May  03 PM
0
0
Sun, 28 May  04 PM
0
0
Sun, 28 May  05 PM
0
0
Sun, 28 May  06 PM
0
0

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


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