Air Quality Forecast

The air quality forecast for Saturday, September 19  is for little change in conditions. Air quality levels will be GOOD to MODERATE throughout the day.

The air quality forecast for Sunday, September 20  is for little change in conditions. Air quality levels will be GOOD to MODERATE throughout the day.

The air quality forecast for Monday, September 21  is for little change in conditions. Air quality levels will be GOOD to MODERATE throughout the day.

The Forecast for Sunday and Monday was 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 a 50

Good

Green

51 a 100

Moderate

Yellow

101 a 150

Unhealthy for Sensitive Groups (U.S.G.)

Orange

151 a 200

Unhealthy

Red

201 a 300

Very Unhealthy

Purple

301 a 500

Hazardous

Maroon

 

City

Forecast Maximum AQI
and Pollutant

Measured Maximum AQI
and Pollutant

  SEPTEMBER 19

SEPTEMBER 20

SEPTEMBER 21

SEPTEMBER 18

Alpine

77

OZONE

67

OZONE

61

OZONE

67

OZONE

Chula Vista

46

OZONE

50

PM2.5

50

PM2.5

50

PM2.5

Del Mar

55

PM2.5

50

PM2.5

46

PM2.5

57

PM2.5

Downtown

53

PM2.5

55

PM2.5

55

PM2.5

55

PM2.5

El Cajon

67

OZONE

61

OZONE

54

OZONE

77
OZONE

Escondido

67

OZONE

61

OZONE

54

OZONE

77

OZONE

Otay Mesa

67

OZONE

66

PM2.5

63

PM2.5

90

PM2.5

Kearny Mesa

61

OZONE

51

OZONE

50

PM2.5

77

OZONE

Oceanside

55

PM2.5

50

PM2.5

46

PM2.5

57

PM2.5



POLLUTANT SPECIFIC FORECASTS

City

Forecast Maximum AQI
OZONE

  SEPTEMBER 19

SEPTEMBER 20

SEPTEMBER 21

Alpine

77

MODERATE

67

MODERATE

61

MODERATE

Chula Vista

46

GOOD

44

GOOD

41

GOOD

Del Mar

41

GOOD

40

GOOD

37

GOOD

Downtown

43

GOOD

42

GOOD

40

GOOD

El Cajon

67

MODERATE

61

MODERATE

54

MODERATE

Escondido

67

MODERATE

61

MODERATE

54

MODERATE

Otay Mesa

67

MODERATE

54

MODERATE

46

GOOD

Kearny Mesa

61

MODERATE

51

MODERATE

44

GOOD

Oceanside

41

GOOD

40

GOOD

37

GOOD

 

City

Forecast Maximum AQI
PM2.5

  SEPTEMBER 19

SEPTEMBER 20

SEPTEMBER 21

Alpine

25

GOOD

29

GOOD

33

GOOD

Chula Vista

46

GOOD

50

GOOD

50

GOOD

Del Mar

55

MODERATE

50

GOOD

46

GOOD

Downtown

53

MODERATE

55

MODERATE

55

MODERATE

El Cajon

42

GOOD

46

GOOD

53

MODERATE

Escondido

42

GOOD

46

GOOD

53

MODERATE

Otay Mesa

63

MODERATE

66

MODERATE

63

MODERATE

Kearny Mesa

46

GOOD

50

GOOD

50

GOOD

Oceanside

55

MODERATE

50

GOOD

46

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