Rest

Data time: 4/19/2026 10:00 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
Ozone	8	PPB

Historical Data Concentration

Hour	AQI	Class	Program	Responsible Pollutant	Activity Caution	Risk Groups
22:00	7	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
21:00	1	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
20:00	16	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
19:00	39	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
18:00	41	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.