How is an Ozone Action Day Determined?
Ozone Action Days are declared during the summer, generally between May and September, when harmful ground-level ozone concentrations are likely to occur. Hot weather, along with high levels of emissions can trigger an Ozone Action Day declaration. A team of local air quality experts are consulted to determine when Ozone Action Day conditions are most likely to form high levels of ground-level ozone. The teams’ assessment is based on air quality monitors throughout the eight participating counties in Northeast Ohio. This decision is based upon an assessment of local weather conditions and expected ozone concentrations for the following day. Specific monitor information can be found at the Northeast Ohio Air Quality Online site. This site gives current and specific information for each of the 16 areawide air quality monitors. Once possible conditions for an Ozone Action Day are determined, a fax or email notification is sent out to participating businesses, local governments, and the me
