Ashburn

Data time: 5/4/2026 8:00 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	1	PPB
Ozone	54	PPB
PM10	14	UG/M3
PM2.5	4.9	UG/M3

Historical Data Concentration

Hour	AQI	Class	Program	Responsible Pollutant	Activity Caution	Risk Groups
20:00	1	Good	NO2	NO2	None	None
20:00	50	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
20:00	13	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
20:00	27	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
19:00	1	Good	NO2	NO2	None	None
19:00	50	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
19:00	12	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
19:00	28	Good	PM2.5	PM2.5	None	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	50	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
18:00	12	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
18:00	29	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
17:00	1	Good	NO2	NO2	None	None
17:00	50	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
17:00	11	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
17:00	28	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
16:00	1	Good	NO2	NO2	None	None
16:00	50	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
16:00	10	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	0	Good	NO2	NO2	None	None
15:00	50	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
15:00	9	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.