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Ashburn

Data time: 11/7/2025 11:00 AM ET

Monitoring Site

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

Air Quality Information
Pollutant	Concentration	Units of Measure
NO2	1	PPB
Ozone	37	PPB
PM10	22	UG/M3
PM2.5	4.6	UG/M3

Historical Data Concentration

Hour	AQI	Class	Program	Responsible Pollutant	Activity Caution	Risk Groups
11:00	1	Good	NO2	NO2	None	None
11:00	34	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
11:00	20	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
11:00	26	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
10:00	2	Good	NO2	NO2	None	None
10:00	31	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
10:00	20	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
10:00	25	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
09:00	5	Good	NO2	NO2	None	None
09:00	26	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
09:00	19	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
09:00	28	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
08:00	12	Good	NO2	NO2	None	None
08:00	16	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
08:00	19	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
08:00	32	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
07:00	18	Good	NO2	NO2	None	None
07:00	6	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
07:00	19	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
07:00	33	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
06:00	18	Good	NO2	NO2	None	None
06:00	20	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
06:00	19	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.