Rest

Data time: 9/17/2026 9:00 AM 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	37	PPB
PM10	26	UG/M3
PM2.5	9.5	UG/M3

Historical Data Concentration

Hour	AQI	Class	Program	Responsible Pollutant	Activity Caution	Risk Groups
09:00	34	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
09:00	24	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
09:00	52	Moderate	PM2.5	PM2.5	Respiratory symptoms possible in unusually sensitive individuals, possible aggravation of heart or lung disease in people with cardiopulmonary disease and older adults.	People with respiratory or heart disease, the elderly and children are the groups most at risk.
08:00	20	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
08:00	24	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
08:00	49	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
07:00	25	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
07:00	52	Moderate	PM2.5	PM2.5	Respiratory symptoms possible in unusually sensitive individuals, possible aggravation of heart or lung disease in people with cardiopulmonary disease and older adults.	People with respiratory or heart disease, the elderly and children are the groups most at risk.
06:00	24	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
06:00	47	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
05:00	23	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
05:00	46	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
04:00	23	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.