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Ashburn

Data time: 8/9/2026 9:00 PM ET

Location
Address:	Broad Run High School
Latitude:	39.02473
Longitude:	-77.48925
Region:	Northern

Air Quality Information
Pollutant	Concentration	Units of Measure
NO2	4	PPB
Ozone	31	PPB
PM10	18	UG/M3
PM2.5	13.5	UG/M3

Historical Data Concentration

Hour	AQI	Class	Program	Responsible Pollutant	Activity Caution	Risk Groups
21:00	4	Good	NO2	NO2	None	None
21:00	29	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
21:00	17	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
21:00	59	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.
20:00	2	Good	NO2	NO2	None	None
20:00	36	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
20:00	16	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
20:00	59	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.
19:00	2	Good	NO2	NO2	None	None
19:00	40	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
19:00	16	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
19:00	58	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.
18:00	1	Good	NO2	NO2	None	None
18:00	41	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
18:00	16	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
18:00	58	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.
17:00	0	Good	NO2	NO2	None	None
17:00	41	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
17:00	15	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
17:00	58	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.
16:00	0	Good	NO2	NO2	None	None
16:00	35	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
16:00	15	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.