Air Quality Forecast Guidance

Displayed below are NOAA-EPA Air Quality Forecast Guidance values for
latitude: 47.40 N, longitude: 121.52 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 05/30, 4Z)
44
39
*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, 29 May  12 PM
28
27
Mon, 29 May  01 PM
30
26
Mon, 29 May  02 PM
32
27
Mon, 29 May  03 PM
36
27
Mon, 29 May  04 PM
37
29
Mon, 29 May   05 PM
39
31
Mon, 29 May   06 PM
41
34
Mon, 29 May   07 PM
45
36
Mon, 29 May   08 PM
44
38
Mon, 29 May   09 PM
38
39
Mon, 29 May   10 PM
30
39
Mon, 29 May   11 PM
28
38
Tue, 30 May   12 AM
24
36
Tue, 30 May   01 AM
23
34
Tue, 30 May   02 AM
20
31
Tue, 30 May   03 AM
19
28
Tue, 30 May   04 AM
23
26
Tue, 30 May   05 AM
17
23
Tue, 30 May   06 AM
16
21
Tue, 30 May   07 AM
18
20
Tue, 30 May   08 AM
17
19
Tue, 30 May   09 AM
18
19
Tue, 30 May   10 AM
21
19
Tue, 30 May   11 AM
24
19
Tue, 30 May   12 PM
26
20
Tue, 30 May   01 PM
27
21
Tue, 30 May   02 PM
29
23
Tue, 30 May   03 PM
32
24
Tue, 30 May   04 PM
35
26
Tue, 30 May   05 PM
38
29
Tue, 30 May   06 PM
42
31
Tue, 30 May   07 PM
44
34
Tue, 30 May   08 PM
43
36
Tue, 30 May   09 PM
38
38
Tue, 30 May   10 PM
29
38
Tue, 30 May   11 PM
28
37
Wed, 31 May   12 AM
26
36
Wed, 31 May   01 AM
25
34
Wed, 31 May   02 AM
24
32
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, 29 May  12 PM
0
0
Mon, 29 May  01 PM
0
0
Mon, 29 May  02 PM
0
0
Mon, 29 May  03 PM
0
0
Mon, 29 May  04 PM
0
0
Mon, 29 May  05 PM
0
0
Mon, 29 May  06 PM
0
0
Mon, 29 May  07 PM
0
0
Mon, 29 May  08 PM
0
0
Mon, 29 May  09 PM
0
0
Mon, 29 May  10 PM
0
0
Mon, 29 May  11 PM
0
0
Tue, 30 May  12 AM
0
0
Tue, 30 May  01 AM
0
0
Tue, 30 May  02 AM
0
0
Tue, 30 May  03 AM
0
0
Tue, 30 May  04 AM
0
0
Tue, 30 May  05 AM
0
0
Tue, 30 May  06 AM
0
0
Tue, 30 May  07 AM
0
0
Tue, 30 May  08 AM
0
0
Tue, 30 May  09 AM
0
0
Tue, 30 May  10 AM
0
0
Tue, 30 May  11 AM
0
0
Tue, 30 May  12 PM
0
0
Tue, 30 May  01 PM
0
0
Tue, 30 May  02 PM
0
0
Tue, 30 May  03 PM
0
0
Tue, 30 May  04 PM
0
0
Tue, 30 May  05 PM
0
0
Tue, 30 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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