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Air Quality Forecast

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The air quality forecast for Saturday, May 23, is for little change in conditions. Air quality levels will be GOOD throughout the day.

The air quality forecast for Sunday, May 24, is for little change in conditions. Air quality levels will be GOOD throughout the day.

The air quality forecast for Monday, May 25, is for less favorable conditions. Air quality levels will be GOOD to MODERATE throughout the day.

Forecasts for Sunday and Monday are issued on Friday and subject to be slightly different due to unexpected changes in meteorological conditions. Please refer to the "Current Ozone & PM2.5 Pollution Map" for up to date information.

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
and Pollutant

Measured Maximum AQI
and Pollutant

  MAY 23

MAY 24

MAY 25

MAY 22

Alpine

42

OZONE

47

OZONE

51

OZONE

36

OZONE

Chula Vista

34

OZONE

34

OZONE

46

PM2.5

34

OZONE

Del Mar

34

OZONE

34

OZONE

46

PM2.5

31

OZONE

Downtown

34

OZONE

34

OZONE

53

PM2.5

34

OZONE

El Cajon

34

OZONE

38

OZONE

42

OZONE

31

OZONE

Escondido

34

OZONE

38

OZONE

42

OZONE

37

OZONE

Otay Mesa

38

OZONE

42

OZONE

53

PM2.5

39

OZONE

Kearny Mesa

34

OZONE

38

OZONE

42

OZONE

35

OZONE

Oceanside

38

OZONE

38

OZONE

42

OZONE

36

OZONE


POLLUTANT SPECIFIC FORECASTS

City

Forecast Maximum AQI
OZONE

  MAY 23

MAY 24

MAY 25

Alpine

42

GOOD

47

GOOD

51

MODERATE

Chula Vista

34

GOOD

34

GOOD

38

GOOD

Del Mar

34

GOOD

34

GOOD

38

GOOD

Downtown

34

GOOD

34

GOOD

34

GOOD

El Cajon

34

GOOD

38

GOOD

42

GOOD

Escondido

34

GOOD

38

GOOD

42

GOOD

Otay Mesa

38

GOOD

42

GOOD

47

GOOD

Kearny Mesa

34

GOOD

38

GOOD

42

GOOD

Oceanside

38

GOOD

38

GOOD

42

GOOD

 

City

Forecast Maximum AQI
PM2.5
  MAY 23

MAY 24

MAY 25

Alpine

25

GOOD

25

GOOD

42

GOOD

Chula Vista

25

GOOD

25

GOOD

46

GOOD

Del Mar

25

GOOD

25

GOOD

46

GOOD

Downtown

25

GOOD

25

GOOD

53

MODERATE

El Cajon

25

GOOD

25

GOOD

42

GOOD

Escondido

25

GOOD

25

GOOD

42

GOOD

Otay Mesa

25

GOOD

25

GOOD

53

MODERATE

Kearny Mesa

25

GOOD

25

GOOD

42

GOOD

Oceanside

25

GOOD

25

GOOD

42

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.

BR / 1630 PST