The Real-time Air Advisory Network (RAAN) is a tool to protect the health of the residents of the San Joaquin Valley. It provides hourly air quality information for your local neighborhood and allows you to take action, when necessary, to avoid poor air quality.
- Pm 2.5 - Official EPA measurement of pollution, PM 2.5 is the particulate matter with a diameter of 2.5 micrometers or less. Smaller than a human hair and not visible to the eye it can be found in wood smoke.
- Ozone - Official EPA measurement of pollution, ozone is a gas comprised of three oxygen atoms, formed through the interaction between NOx, VOC, and sunlight. Often a result of vehicles and other mobile sources of pollution.
- Contact the Health Services Department for more information on possible school closures:
- (209) 933-7060