Welcome! This information on ground level Ozone (O3) concentrations for San Juan County, NM is based on a photochemical model. This is a joint NOAA-EPA product of the Air Quality Forecast System by the National Weather Service. Please note that this is a nationally based forecast only. Actual data collected by the Air Quality Bureau may differ. You may sign-up to receive forecasts for San Juan County ozone based on different thresholds. For example you can choose to receive a daily ozone forecast or to receive a forecast only when the model predicts unhealthy levels. An Ozone Action Day will be declared for San Juan County if the Air Quality Index (AQI) forecast for San Juan County is 101 (category Unhealthy for Sensitive Groups) or higher. AQI 101-150 corresponds to an ozone 8-hour average (ppm) 0.076 - 0.095 ppm. On Ozone Action Days you will receive a special message with health precautions and tips on how you can make a difference by reducing emissions that lead to ozone. For Information on New Mexico Ozone: http://www.nmenv.state.nm.us/aqb/Ozone.html. For Information on San Juan County Ozone Action Days: http://www.nmenv.state.nm.us/aqb/control_strat/SanJuanCountyOzone.htm. For more information, please contact: Mark Jones, Environmental Analyst, NMED Air Quality Bureau, Direct line (505)566-9746, 3400 Messina Drive, Suite 5000, Farmington, NM 87402, Thank you for your interest in Four Corners area air quality