Air Quality Forecast Guidance

Displayed below are NOAA-EPA Air Quality Forecast Guidance values for
latitude: 47.48 N, longitude: 121.00 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 08/01, 4Z)
44
41
*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
Sat, 31 Jul  10 PM
38
41
Sat, 31 Jul  11 PM
38
41
Sun, 01 Aug  12 AM
38
41
Sun, 01 Aug  01 AM
39
41
Sun, 01 Aug  02 AM
38
40
Sun, 01 Aug  03 AM
36
39
Sun, 01 Aug  04 AM
32
37
Sun, 01 Aug  05 AM
30
36
Sun, 01 Aug  06 AM
32
35
Sun, 01 Aug  07 AM
32
34
Sun, 01 Aug  08 AM
31
33
Sun, 01 Aug  09 AM
30
32
Sun, 01 Aug  10 AM
31
32
Sun, 01 Aug  11 AM
29
31
Sun, 01 Aug  12 PM
30
31
Sun, 01 Aug  01 PM
36
32
Sun, 01 Aug  02 PM
39
33
Sun, 01 Aug  03 PM
40
34
Sun, 01 Aug  04 PM
40
35
Sun, 01 Aug   05 PM
41
36
Sun, 01 Aug   06 PM
43
37
Sun, 01 Aug   07 PM
44
39
Sun, 01 Aug   08 PM
43
41
Sun, 01 Aug   09 PM
39
41
Sun, 01 Aug   10 PM
35
41
Sun, 01 Aug   11 PM
34
40
Mon, 02 Aug   12 AM
35
39
Mon, 02 Aug   01 AM
39
39
Mon, 02 Aug   02 AM
45
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
Sat, 31 Jul  10 PM
0
71
Sat, 31 Jul  11 PM
0
65
Sun, 01 Aug  12 AM
5
102
Sun, 01 Aug  01 AM
69
77
Sun, 01 Aug  02 AM
97
65
Sun, 01 Aug  03 AM
59
74
Sun, 01 Aug  04 AM
70
82
Sun, 01 Aug  05 AM
708
113
Sun, 01 Aug  06 AM
525
141
Sun, 01 Aug  07 AM
562
95
Sun, 01 Aug  08 AM
85
57
Sun, 01 Aug  09 AM
0
37
Sun, 01 Aug  10 AM
231
31
Sun, 01 Aug  11 AM
0
24
Sun, 01 Aug  12 PM
0
16
Sun, 01 Aug  01 PM
47
22
Sun, 01 Aug  02 PM
0
13
Sun, 01 Aug  03 PM
0
9
Sun, 01 Aug  04 PM
0
5
Sun, 01 Aug  05 PM
0
19
Sun, 01 Aug  06 PM
145
26
Sun, 01 Aug  07 PM
259
43
Sun, 01 Aug  08 PM
0
39
Sun, 01 Aug  09 PM
197
95
Sun, 01 Aug  10 PM
183
372

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


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