The Maryland Department of the Environment has issued an air quality advisory for June 20, the first day of summer.
On top of the soaring temperatures and muggy humidity, officials forecast an air quality index (AQI) of 106-in the "orange" or "Unhealthy for Sensitive Groups" range because of high levels of ozone.
On Wednesday and Thursday, hot and humid conditions with light, west-northwesterly winds will cause ozone and fine particle levels to rise, according to MDE. Fine particles are expected to remain in the Moderate AQI range, officials said.
According to the National Weather Service, Pikesville as well as the D.C. Baltmore Metropolitan area could see a high of 100 degrees on Thursday.
But there are places where you can go to keep cool, including libraries and senior centers.
A cold front is forecast to roll into the region on Friday, which may produce cloud cover and thunderstorms. A Moderate AQI is expected to result after the front passes through later in the day on Friday, according to MDE.
Updated air quality information and forecasts are available through MDE's Air Quality Hotline at 410-537-3247.
Does air quality affect you? If so, what do you do to stay comfortable?