Air Quality Forecast Guidance for Portola Valley, CA

Displayed below are NOAA-EPA Air Quality Forecast Guidance values for
latitude: 37.34 N, longitude: 122.28 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 09/21, 4Z)
55
48
*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, 20 Sep  09 PM
30
45
Mon, 20 Sep  10 PM
33
43
Mon, 20 Sep  11 PM
32
41
Tue, 21 Sep  12 AM
31
38
Tue, 21 Sep  01 AM
30
35
Tue, 21 Sep  02 AM
28
32
Tue, 21 Sep  03 AM
26
30
Tue, 21 Sep  04 AM
23
29
Tue, 21 Sep  05 AM
15
27
Tue, 21 Sep  06 AM
21
26
Tue, 21 Sep  07 AM
20
24
Tue, 21 Sep  08 AM
19
23
Tue, 21 Sep  09 AM
25
22
Tue, 21 Sep  10 AM
36
23
Tue, 21 Sep  11 AM
46
26
Tue, 21 Sep  12 PM
54
30
Tue, 21 Sep  01 PM
61
35
Tue, 21 Sep  02 PM
65
41
Tue, 21 Sep  03 PM
62
46
Tue, 21 Sep  04 PM
54
50
Tue, 21 Sep   05 PM
46
53
Tue, 21 Sep   06 PM
45
54
Tue, 21 Sep   07 PM
41
53
Tue, 21 Sep   08 PM
37
51
Tue, 21 Sep   09 PM
35
48
Tue, 21 Sep   10 PM
35
44
Tue, 21 Sep   11 PM
33
41
Wed, 22 Sep   12 AM
31
38
Wed, 22 Sep   01 AM
32
36
Wed, 22 Sep   02 AM
32
34
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, 20 Sep  09 PM
7
1
Mon, 20 Sep  10 PM
8
1
Mon, 20 Sep  11 PM
6
1
Tue, 21 Sep  12 AM
3
0
Tue, 21 Sep  01 AM
3
0
Tue, 21 Sep  02 AM
2
0
Tue, 21 Sep  03 AM
2
1
Tue, 21 Sep  04 AM
3
3
Tue, 21 Sep  05 AM
6
6
Tue, 21 Sep  06 AM
6
8
Tue, 21 Sep  07 AM
7
10
Tue, 21 Sep  08 AM
8
9
Tue, 21 Sep  09 AM
5
10
Tue, 21 Sep  10 AM
4
13
Tue, 21 Sep  11 AM
2
14
Tue, 21 Sep  12 PM
3
22
Tue, 21 Sep  01 PM
14
26
Tue, 21 Sep  02 PM
4
13
Tue, 21 Sep  03 PM
26
12
Tue, 21 Sep  04 PM
23
9
Tue, 21 Sep  05 PM
9
8
Tue, 21 Sep  06 PM
15
7
Tue, 21 Sep  07 PM
19
8
Tue, 21 Sep  08 PM
8
8
Tue, 21 Sep  09 PM
20
7
Tue, 21 Sep  10 PM
29
7

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


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