Tomorrow, May 12th has been declared an Air Quality Advisory Day.
Ozone in one or more of the following counties may reach "Unhealthy for Sensitive Populations" levels: Ashtabula, Cuyahoga, Geauga, Lake, Lorain, Medina, Portage and Summit.
People included in the "Sensitive Population" designation include: Anyone with chronic breathing issues like COPD, emphysema or asthma, young children, and the very old.
It is recommended that strenuous outdoor activity be limited by people in the Sensitive Population.
Original source can be found here