San Diego County
Air Pollution
Control District
-
Air Quality Forecast -
AQ Forecast by Site -
About
Air Quality Forecast
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.
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 |
These AQI colors are a modified version of the original AQI and provide better accessibility for those with color vision deficiencies.
Forecast Daily Maximum AQI | ||||
CITY |
SUNDAY, SEPTEMBER 20 | MONDAY, SEPTEMBER 21 | ||
Alpine | 67 | OZONE | 50 | OZONE |
Chula Vista | 53 | PM2.5 | 50 | PM2.5 |
Del Mar | 53 | PM2.5 | 50 | PM2.5 |
Downtown | 55 | PM2.5 | 53 | PM2.5 |
El Cajon | 50 | OZONE | 50 | PM2.5 |
Escondido | 50 | OZONE | 50 | PM2.5 |
Otay Mesa | 56 | PM2.5 | 55 | PM2.5 |
Kearny Mesa | 53 | PM2.5 | 50 | PM2.5 |
Oceanside | 53 | PM2.5 | 50 | PM2.5 |
San Ysidro | 58 | PM2.5 | 56 | PM2.5 |
Forecast Pollutant Specific Maximum AQI | ||||
SUNDAY, SEPTEMBER 20 | ||||
CITY |
OZONE | PM2.5 | ||
Alpine | 67 | MODERATE | 39 | GOOD |
Chula Vista | 44 | GOOD | 53 | MODERATE |
Del Mar | 44 | GOOD | 53 | MODERATE |
Downtown | 43 | GOOD | 55 | MODERATE |
El Cajon | 50 | GOOD | 50 | GOOD |
Escondido | 50 | GOOD | 50 | GOOD |
Otay Mesa | 47 | GOOD | 56 | MODERATE |
Kearny Mesa | 44 | GOOD | 53 | MODERATE |
Oceanside | 44 | GOOD | 53 | MODERATE |
San Ysidro | 44 | GOOD | 58 | MODERATE |
MONDAY, SEPTEMBER 21 | ||||
CITY |
OZONE | PM2.5 | ||
Alpine | 50 | GOOD | 44 | GOOD |
Chula Vista | 41 | GOOD | 50 | GOOD |
Del Mar | 41 | GOOD | 50 | GOOD |
Downtown | 39 | GOOD | 53 | MODERATE |
El Cajon | 44 | GOOD | 50 | GOOD |
Escondido | 44 | GOOD | 50 | GOOD |
Otay Mesa | 42 | GOOD | 55 | MODERATE |
Kearny Mesa | 40 | GOOD | 50 | GOOD |
Oceanside | 41 | GOOD | 50 | GOOD |
San Ysidro | 41 | 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 email APCDWX@sdapcd.org. If you have an air pollution complaint, or see an air pollution problem, please call (858) 586-2650. Thank you.