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Air Quality Forecast Guidance for St. Helena, NC

Displayed below are NOAA-EPA Air Quality Forecast Guidance values for
latitude: 34.51 N, longitude: 77.89 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 05/28, 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)

6Z Model Run
8 Hour Average Ozone
Concentration (PPB)

6Z Model Run
Wed, 27 May  10 AM
37
34
Wed, 27 May  11 AM
38
34
Wed, 27 May  12 PM
40
35
Wed, 27 May  01 PM
39
36
Wed, 27 May  02 PM
39
36
Wed, 27 May  03 PM
38
37
Wed, 27 May  04 PM
38
38
Wed, 27 May  05 PM
40
39
Wed, 27 May  06 PM
41
39
Wed, 27 May  07 PM
39
39
Wed, 27 May   08 PM
36
39
Wed, 27 May   09 PM
35
38
Wed, 27 May   10 PM
34
38
Wed, 27 May   11 PM
34
37
Thu, 28 May   12 AM
33
36
Thu, 28 May   01 AM
32
36
Thu, 28 May   02 AM
32
34
Thu, 28 May   03 AM
31
34
Thu, 28 May   04 AM
30
33
Thu, 28 May   05 AM
30
32
Thu, 28 May   06 AM
29
32
Thu, 28 May   07 AM
29
31
Thu, 28 May   08 AM
31
31
Thu, 28 May   09 AM
35
31
Thu, 28 May   10 AM
37
32
Thu, 28 May   11 AM
40
33
Thu, 28 May   12 PM
42
34
Thu, 28 May   01 PM
44
36
Thu, 28 May   02 PM
45
38
Thu, 28 May   03 PM
44
40
Thu, 28 May   04 PM
42
41
Thu, 28 May   05 PM
39
42
Thu, 28 May   06 PM
37
42
Thu, 28 May   07 PM
35
41
Thu, 28 May   08 PM
34
40
Thu, 28 May   09 PM
34
39
Thu, 28 May   10 PM
33
37
Thu, 28 May   11 PM
30
36
Fri, 29 May   12 AM
28
34
Fri, 29 May   01 AM
26
32
Fri, 29 May   02 AM
24
31
Smoke
Ending Time
(Local Time)
1 Hour Surface Smoke (µg/m³)
06Z Model Run
1 Hour Column-Integrated
Smoke (µg/m³)

06Z Model Run
Wed, 27 May  09 AM
0
0
Wed, 27 May  10 AM
0
0
Wed, 27 May  11 AM
0
0
Wed, 27 May  12 PM
0
0
Wed, 27 May  01 PM
0
0
Wed, 27 May  02 PM
0
0
Wed, 27 May  03 PM
0
0
Wed, 27 May  04 PM
0
0
Wed, 27 May  05 PM
0
0
Wed, 27 May  06 PM
0
0
Wed, 27 May  07 PM
0
0
Wed, 27 May  08 PM
0
0
Wed, 27 May  09 PM
0
0
Wed, 27 May  10 PM
0
0
Wed, 27 May  11 PM
0
0
Thu, 28 May  12 AM
0
0
Thu, 28 May  01 AM
0
0
Thu, 28 May  02 AM
0
0
Thu, 28 May  03 AM
0
0
Thu, 28 May  04 AM
0
0
Thu, 28 May  05 AM
0
0
Thu, 28 May  06 AM
0
0
Thu, 28 May  07 AM
0
0
Thu, 28 May  08 AM
0
0
Thu, 28 May  09 AM
0
0
Thu, 28 May  10 AM
0
0
Thu, 28 May  11 AM
0
0
Thu, 28 May  12 PM
0
0
Thu, 28 May  01 PM
0
0
Thu, 28 May  02 PM
0
0
Thu, 28 May  03 PM
0
0
Thu, 28 May  04 PM
0
0
Thu, 28 May  05 PM
0
0
Thu, 28 May  06 PM
0
0
Thu, 28 May  07 PM
0
0
Thu, 28 May  08 PM
0
0
Thu, 28 May  09 PM
0
0
Thu, 28 May  10 PM
0
0
Thu, 28 May  11 PM
0
0
Fri, 29 May  12 AM
0
0
Fri, 29 May  01 AM
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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