Air Quality Forecast Guidance

Displayed below are NOAA-EPA Air Quality Forecast Guidance values for
latitude: 47.43 N, longitude: 121.41 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 09/29, 4Z)
35
32
*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)
6Z Model Run
8 Hour Average Ozone
Concentration (PPB)
6Z Model Run
Thu, 28 Sep  07 AM
34
29
Thu, 28 Sep  08 AM
33
30
Thu, 28 Sep  09 AM
30
30
Thu, 28 Sep  10 AM
27
30
Thu, 28 Sep  11 AM
26
29
Thu, 28 Sep  12 PM
27
30
Thu, 28 Sep  01 PM
29
30
Thu, 28 Sep  02 PM
33
30
Thu, 28 Sep  03 PM
31
30
Thu, 28 Sep  04 PM
29
29
Thu, 28 Sep   05 PM
29
29
Thu, 28 Sep   06 PM
29
29
Thu, 28 Sep   07 PM
32
30
Thu, 28 Sep   08 PM
33
31
Thu, 28 Sep   09 PM
34
31
Thu, 28 Sep   10 PM
33
31
Thu, 28 Sep   11 PM
30
31
Fri, 29 Sep   12 AM
28
31
Fri, 29 Sep   01 AM
26
31
Fri, 29 Sep   02 AM
26
30
Fri, 29 Sep   03 AM
24
29
Fri, 29 Sep   04 AM
26
28
Fri, 29 Sep   05 AM
23
27
Fri, 29 Sep   06 AM
27
26
Fri, 29 Sep   07 AM
30
26
Fri, 29 Sep   08 AM
30
27
Fri, 29 Sep   09 AM
25
26
Fri, 29 Sep   10 AM
21
26
Fri, 29 Sep   11 AM
22
25
Fri, 29 Sep   12 PM
28
26
Fri, 29 Sep   01 PM
33
27
Fri, 29 Sep   02 PM
37
28
Fri, 29 Sep   03 PM
35
29
Fri, 29 Sep   04 PM
35
29
Fri, 29 Sep   05 PM
34
31
Fri, 29 Sep   06 PM
32
32
Fri, 29 Sep   07 PM
29
33
Fri, 29 Sep   08 PM
25
32
Fri, 29 Sep   09 PM
25
31
Fri, 29 Sep   10 PM
25
30
Fri, 29 Sep   11 PM
23
28
Sat, 30 Sep   12 AM
24
27
Sat, 30 Sep   01 AM
25
26
Sat, 30 Sep   02 AM
26
25
Smoke
Ending Time
(Local Time)
1 Hour Surface Smoke (µg/m³)
06Z Model Run
1 Hour Column-Integrated
Smoke (µg/m³)
06Z Model Run
Thu, 28 Sep  05 AM
0
0
Thu, 28 Sep  06 AM
0
0
Thu, 28 Sep  07 AM
0
0
Thu, 28 Sep  08 AM
0
0
Thu, 28 Sep  09 AM
0
0
Thu, 28 Sep  10 AM
0
0
Thu, 28 Sep  11 AM
0
0
Thu, 28 Sep  12 PM
0
0
Thu, 28 Sep  01 PM
0
0
Thu, 28 Sep  02 PM
0
0
Thu, 28 Sep  03 PM
0
0
Thu, 28 Sep  04 PM
0
0
Thu, 28 Sep  05 PM
0
0
Thu, 28 Sep  06 PM
0
0
Thu, 28 Sep  07 PM
0
0
Thu, 28 Sep  08 PM
0
0
Thu, 28 Sep  09 PM
0
0
Thu, 28 Sep  10 PM
0
0
Thu, 28 Sep  11 PM
0
0
Fri, 29 Sep  12 AM
0
0
Fri, 29 Sep  01 AM
0
0
Fri, 29 Sep  02 AM
0
0
Fri, 29 Sep  03 AM
0
0
Fri, 29 Sep  04 AM
0
0
Fri, 29 Sep  05 AM
0
0
Fri, 29 Sep  06 AM
0
0
Fri, 29 Sep  07 AM
0
0
Fri, 29 Sep  08 AM
0
0
Fri, 29 Sep  09 AM
0
0
Fri, 29 Sep  10 AM
0
0
Fri, 29 Sep  11 AM
0
0
Fri, 29 Sep  12 PM
0
0
Fri, 29 Sep  01 PM
0
0
Fri, 29 Sep  02 PM
0
0
Fri, 29 Sep  03 PM
0
0
Fri, 29 Sep  04 PM
0
0
Fri, 29 Sep  05 PM
0
0
Fri, 29 Sep  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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