Code Orange Air Quality Alert On Friday

It includes Frederick County.

...AIR QUALITY ALERT IS IN EFFECT FOR FRIDAY JULY 21 2017...

The Metropolitan Washington Council of Governments in association
with Maryland Department of the Environment, Virginia Department
of Environmental Quality, and District Department of Environment
has issued a Code ORANGE Air Quality Alert Friday for
the DC metro area.

A Code Orange Air Quality Alert means that air pollution
concentrations within the region may become unhealthy for
sensitive groups. Sensitive groups include children, people
suffering from asthma, heart disease or other lung diseases and
the elderly. The effects of air pollution can be minimized by
avoiding strenuous activity or exercise outdoors.

By The National Weather Service