The air quality forecast for Wednesday, September 18, is for little change in conditions. Air quality levels will be GOOD to MODERATE throughout the day.
Air quality reports use the Air Quality Index, which represents the higher of two pollutants - PM2.5 or ozone. For ground-level ozone (O3), these values are based upon an 8-hour running average. For ground-level particulate matter with a diameter less than 2.5 microns (PM2.5), these values are based upon a 24-hour daily average.
Air Quality Index
(AQI) Values
Levels of Health Concern
Colors
When the AQI
is in this range:
...air quality conditions are:
...as symbolized
by this color:
0 to 50
Good
Green
51 to 100
Moderate
Yellow
101 to 150
Unhealthy for
Sensitive Groups (U.S.G)
Orange
151 to 200
Unhealthy
Red
201 to 300
Very Unhealthy
Purple
301 to 500
Hazardous
Maroon
City
Forecast Maximum AQI
Pollutant
Measured Maximum AQI
Pollutant
WEDNESDAY, SEPTEMBER 18
TUESDAY, SEPTEMBER 17
Alpine
48
OZONE
47
OZONE
Chula Vista
33
OZONE
31
OZONE
Del Mar
30
OZONE
28
OZONE
Downtown
33
OZONE
31
OZONE
El Cajon
43
OZONE
41
OZONE
Escondido
43
OZONE
41
OZONE
Otay Mesa
53
PM2.5
44
PM2.5
Kearny Mesa
35
OZONE
32
OZONE
Oceanside
30
OZONE
28
OZONE
POLLUTANT SPECIFIC FORECASTS
City
Forecast Maximum AQI OZONE
Forecast Maximum AQI PM2.5
WEDNESDAY, SEPTEMBER 18
WEDNESDAY, SEPTEMBER 18
Alpine
48
GOOD
17
GOOD
Chula Vista
33
GOOD
29
GOOD
Del Mar
30
GOOD
25
GOOD
Downtown
33
GOOD
29
GOOD
El Cajon
43
GOOD
42
GOOD
Escondido
43
GOOD
42
GOOD
Otay Mesa
34
GOOD
53
MODERATE
Kearny Mesa
35
GOOD
25
GOOD
Oceanside
30
GOOD
25
GOOD
In cases where this page is not updated properly, or to hear
the official air pollution forecast, please call our air pollution recording
line at (858) 586-2800. This recording is updated daily Monday through Friday at 4:30 PM.
If you need air quality information, please call (858) 586-2600. If you have an air pollution complaint, or see an air pollution problem, please call (858) 586-2650. Thank you.
