Rest

Data time: 5/20/2026 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
PM10	19	UG/M3
PM2.5	8.2	UG/M3

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.
22:00	18	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
22:00	46	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
21:00	6	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
21:00	18	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
21:00	42	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
20:00	6	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
20:00	18	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
20:00	41	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
19:00	18	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
19:00	19	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
19:00	40	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
18:00	30	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
18:00	19	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
18:00	37	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
17:00	15	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
17:00	19	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.