Rest

Data time: 1/4/2026 7:00 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	33	PPB
PM10	20	UG/M3
PM2.5	7	UG/M3

Historical Data Concentration

Hour	AQI	Class	Program	Responsible Pollutant	Activity Caution	Risk Groups
19:00	31	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	39	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
18:00	31	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	32	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
17:00	31	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.
17:00	29	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
16:00	34	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
16:00	20	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
16:00	27	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
15:00	36	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
15:00	20	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
15:00	27	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
14:00	31	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
14:00	21	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.