Air Quality Forecast

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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.

JD / 1630 PDT