Air Quality Forecast Guidance

Displayed below are NOAA-EPA Air Quality Forecast Guidance values for
latitude: 46.64 N, longitude: 121.38 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 03/19, 4Z)
41
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, 18 Mar  08 PM
26
34
Mon, 18 Mar  09 PM
25
32
Mon, 18 Mar  10 PM
23
31
Mon, 18 Mar  11 PM
22
29
Tue, 19 Mar  12 AM
22
28
Tue, 19 Mar  01 AM
22
26
Tue, 19 Mar  02 AM
23
24
Tue, 19 Mar  03 AM
26
24
Tue, 19 Mar  04 AM
30
24
Tue, 19 Mar  05 AM
32
25
Tue, 19 Mar  06 AM
35
27
Tue, 19 Mar  07 AM
37
29
Tue, 19 Mar  08 AM
35
30
Tue, 19 Mar  09 AM
35
32
Tue, 19 Mar  10 AM
38
34
Tue, 19 Mar  11 AM
42
36
Tue, 19 Mar  12 PM
44
37
Tue, 19 Mar  01 PM
41
38
Tue, 19 Mar  02 PM
39
39
Tue, 19 Mar  03 PM
41
39
Tue, 19 Mar  04 PM
43
40
Tue, 19 Mar   05 PM
48
42
Tue, 19 Mar   06 PM
47
43
Tue, 19 Mar   07 PM
42
43
Tue, 19 Mar   08 PM
39
43
Tue, 19 Mar   09 PM
41
43
Tue, 19 Mar   10 PM
36
42
Tue, 19 Mar   11 PM
34
41
Wed, 20 Mar   12 AM
35
40
Wed, 20 Mar   01 AM
35
39
Wed, 20 Mar   02 AM
42
38
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, 18 Mar  08 PM
0
0
Mon, 18 Mar  09 PM
0
0
Mon, 18 Mar  10 PM
0
0
Mon, 18 Mar  11 PM
0
0
Tue, 19 Mar  12 AM
0
0
Tue, 19 Mar  01 AM
0
0
Tue, 19 Mar  02 AM
0
0
Tue, 19 Mar  03 AM
0
0
Tue, 19 Mar  04 AM
0
0
Tue, 19 Mar  05 AM
0
0
Tue, 19 Mar  06 AM
0
0
Tue, 19 Mar  07 AM
0
0
Tue, 19 Mar  08 AM
0
0
Tue, 19 Mar  09 AM
0
0
Tue, 19 Mar  10 AM
0
0
Tue, 19 Mar  11 AM
0
0
Tue, 19 Mar  12 PM
0
0
Tue, 19 Mar  01 PM
0
0
Tue, 19 Mar  02 PM
0
0
Tue, 19 Mar  03 PM
0
0
Tue, 19 Mar  04 PM
0
0
Tue, 19 Mar  05 PM
0
0
Tue, 19 Mar  06 PM
0
0

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


    US Dept of Commerce
    National Oceanic and Atmospheric Administration
    National Weather Service
    1325 East West Highway
    Silver Spring, MD 20910
    Page Author: NWS Internet Services Team
Disclaimer
Information Quality
Credits
Glossary
Privacy Policy
Freedom of Information Act (FOIA)
About Us
Career Opportunities