Air Quality Forecast

The air quality forecast for Wednesday, October 8, is for little change in conditions. Air quality levels will be GOOD to MODERATE throughout the day.

The air quality forecast for Thursday, October 9, is for little change in conditions. Air quality levels will be GOOD to MODERATE throughout the day.

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.

 

AQI Values

Levels of 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

 

Forecast Daily Maximum AQI

CITY

WEDNESDAY, OCTOBER 8

THURSDAY, OCTOBER 9

Alpine

51

OZONE

47

OZONE

Chula Vista

56

PM2.5

53

PM2.5

Del Mar

53

PM2.5

39

PM2.5

Downtown

56

PM2.5

55

PM2.5

El Cajon

55

PM2.5

53

PM2.5

Escondido

55

PM2.5

53

PM2.5

Otay Mesa

60

PM2.5

56

PM2.5

Kearny Mesa

55

PM2.5

50

PM2.5

Oceanside

53

PM2.5

44

PM2.5

San Ysidro

58

PM2.5

56

PM2.5

 

Forecast Pollutant Specific Maximum AQI

WEDNESDAY, OCTOBER 8

CITY

OZONE

PM2.5

Alpine

51

MODERATE

44

GOOD

Chula Vista

38

GOOD

56

MODERATE

Del Mar

39

GOOD

53

MODERATE

Downtown

42

GOOD

56

MODERATE

El Cajon

48

GOOD

55

MODERATE

Escondido

48

GOOD

55

MODERATE

Otay Mesa

46

GOOD

60

MODERATE

Kearny Mesa

45

GOOD

55

MODERATE

Oceanside

42

GOOD

53

MODERATE

San Ysidro

41

GOOD

58

MODERATE

         

THURSDAY, OCTOBER 9

CITY

OZONE

PM2.5

Alpine

47

GOOD

39

GOOD

Chula Vista

36

GOOD

53

MODERATE

Del Mar

38

GOOD

39

GOOD

Downtown

40

GOOD

55

MODERATE

El Cajon

45

GOOD

53

MODERATE

Escondido

45

GOOD

53

MODERATE

Otay Mesa

43

GOOD

56

MODERATE

Kearny Mesa

42

GOOD

50

GOOD

Oceanside

40

GOOD

44

GOOD

San Ysidro

37

GOOD

56

MODERATE

         

In cases where this page is not updated properly, or to hear the air pollution forecast, please call our air pollution recording line at (858) 586-2800. 

If you need air quality information, please call (858) 586-2769. If you have an air pollution complaint, or see an air pollution problem, please call (858) 586-2650. Thank you.