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Air Quality Forecasts

The air quality forecast for Saturday, May 10 is for little change in 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 Pollution Map" for up to date information.

The air quality forecast for Sunday, May 11 is for little change in conditions. Air quality levels will be Good to Moderate throughout the day.

The air quality forecast for Monday, May 12 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 three pollutants - PM2.5, PM10 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) or less than 10 microns (PM10), 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	Orange
151 to 200	Unhealthy	Red
201 to 300	Very Unhealthy	Purple
301 to 500	Hazardous	Maroon

Forecast Maximum AQI Level
MAY 9			MAY 10		MAY 11		MAY 12
Alpine	52	PM2.5	71	OZONE	80	OZONE	54	PM2.5
Chula Vista	41	OZONE	47	OZONE	47	OZONE	44	OZONE
Del Mar	48	OZONE	47	OZONE	47	OZONE	44	OZONE
Downtown	41	OZONE	42	OZONE	42	OZONE	40	OZONE
El Cajon	41	OZONE	52	PM2.5	61	OZONE	45	PM2.5
Escondido	45	PM2.5	51	OZONE	58	OZONE	42	PM2.5
Otay Mesa	37	OZONE	42	OZONE	42	OZONE	41	OZONE
Kearny Mesa	43	OZONE	47	OZONE	47	OZONE	43	OZONE
Oceanside	45	OZONE	47	OZONE	47	OZONE	40	OZONE

Forecast Maximum AQI Level for: OZONE
MAY 10			MAY 11			MAY 12
Alpine	71	MODERATE	80	MODERATE	50	GOOD
Chula Vista	47	GOOD	47	GOOD	44	GOOD
Del Mar	47	GOOD	47	GOOD	44	GOOD
Downtown	42	GOOD	42	GOOD	40	GOOD
El Cajon	51	MODERATE	61	MODERATE	42	GOOD
Escondido	51	MODERATE	58	MODERATE	41	GOOD
Otay Mesa	42	GOOD	42	GOOD	41	GOOD
Kearny Mesa	47	GOOD	47	GOOD	43	GOOD
Oceanside	47	GOOD	47	GOOD	40	GOOD

Forecast Maximum AQI Level for: PM2.5
MAY 10				MAY 11		MAY 12
Alpine	58	MODERATE	60	MODERATE	54	MODERATE
Chula Vista	29	GOOD	32	GOOD	23	GOOD
Del Mar	29	GOOD	32	GOOD	23	GOOD
Downtown	36	GOOD	39	GOOD	26	GOOD
El Cajon	52	MODERATE	54	MODERATE	45	GOOD
Escondido	49	GOOD	52	MODERATE	42	GOOD
Otay Mesa	29	GOOD	32	GOOD	23	GOOD
Kearny Mesa	29	GOOD	32	GOOD	23	GOOD
Oceanside	29	GOOD	32	GOOD	23	GOOD

If you need air quality information, please call (858) 586-2707 during regular working hours. If you have an air pollution complaint, or see an air pollution problem, please call (858) 586-2650. Thank you.

In cases where this web page is not updated properly, or to hear the official air pollution forecast, please call our air pollution forecast recording line at: (858) 586-2800.  This recording is updated daily at 4:30 PM.

WCR / 1630 PDT