Rest

Data time: 9/19/2025 11:00 PM ET

Monitoring Site

Location
Address:	Frederick Co. Public School Maintenance Dept.
Latitude:	39.28101
Longitude:	-78.08157
Region:	Valley

Air Quality Information
Pollutant	Concentration	Units of Measure
PM10	21	UG/M3

Historical Data Concentration

Hour	AQI	Class	Program	Responsible Pollutant	Activity Caution	Risk Groups
23:00	19	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
22:00	20	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
21:00	20	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
20:00	20	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
19:00	19	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
18:00	24	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.