Air Quality Forecast

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The air quality forecast for Saturday, May 18, is for little change in conditions. Air quality levels will be GOOD to MODERATE throughout the day.

The air quality forecast for Sunday, May 19, is for more favorable conditions. Air quality levels will be GOOD throughout the day.

The air quality forecast for Monday, May 20, is for little change in conditions. Air quality levels will be GOOD throughout the day.

The Forecasts for Sunday and Monday were 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 18

MAY 19

MAY 20

MAY 17

Alpine

84

OZONE

46

OZONE

42

OZONE

44

OZONE

Chula Vista

46

OZONE

37

OZONE

32

OZONE

42

OZONE

Del Mar

42

OZONE

37

OZONE

32

OZONE

37

OZONE

Downtown

46

OZONE

37

OZONE

32

OZONE

42

OZONE

El Cajon

51

OZONE

37

OZONE

32

OZONE

42
OZONE

Escondido

51

OZONE

37

OZONE

32

OZONE

42

OZONE

Otay Mesa

46

OZONE

37

OZONE

32

OZONE

39

OZONE

Kearny Mesa

46

OZONE

37

OZONE

32

OZONE

41

OZONE

Oceanside

42

OZONE

37

OZONE

32

OZONE

37

OZONE

 


POLLUTANT SPECIFIC FORECASTS

City

Forecast Maximum AQI
OZONE

  MAY 18

MAY 19

MAY 20

Alpine

84

MODERATE

46

GOOD

42

GOOD

Chula Vista

46

GOOD

37

GOOD

32

GOOD

Del Mar

42

GOOD

37

GOOD

32

GOOD

Downtown

46

GOOD

37

GOOD

32

GOOD

El Cajon

51

MODERATE

37

GOOD

32

GOOD

Escondido

51

MODERATE

37

GOOD

32

GOOD

Otay Mesa

46

GOOD

37

GOOD

32

GOOD

Kearny Mesa

46

GOOD

37

GOOD

32

GOOD

Oceanside

42

GOOD

37

GOOD

32

GOOD

 

City

Forecast Maximum AQI
PM2.5
  MAY 18

MAY 19

MAY 20

Alpine

21

GOOD

13

GOOD

8

GOOD

Chula Vista

42

GOOD

29

GOOD

21

GOOD

Del Mar

42

GOOD

29

GOOD

21

GOOD

Downtown

42

GOOD

29

GOOD

21

GOOD

El Cajon

38

GOOD

25

GOOD

21

GOOD

Escondido

38

GOOD

25

GOOD

21

GOOD

Otay Mesa

42

GOOD

29

GOOD

21

GOOD

Kearny Mesa

42

GOOD

29

GOOD

21

GOOD

Oceanside

38

GOOD

25

GOOD

21

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.

AC / 1630 PDT