a San Joaquin Valley Air Pollution Control District system
The Real-time Air Advisory Network (RAAN) is 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.
Official EPA measurement of pollution, PM 2.5 is 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.
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 source of pollution.
Amount of PM2.5 measured by a monitor during a 1-hour time period.
Amount of ozone measured by a monitor during a 1-hour time period.
Micrograms per cubic meter.
Parts per billion.
The San Joaquin Valley Air Pollution Control District makes every effort to ensure that the air quality information you receive through the Real-time Air Advisory Network is accurate and timely. However, there may be instances when the information is delayed, incorrect or missing. If you experience air quality impacts, such as wildfire smoke, in your neighborhood that are not reflected on the website, please assume that the system is not registering the incident and take appropriate action. Please contact the District at 559-230-6000 to report any abnormality you experience with the system.