Ashburn

Data time: 6/3/2026 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	10	PPB
Ozone	31	PPB
PM10	15	UG/M3
PM2.5	4.3	UG/M3

Historical Data Concentration

Hour	AQI	Class	Program	Responsible Pollutant	Activity Caution	Risk Groups
21:00	9	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	14	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
21:00	24	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
20:00	8	Good	NO2	NO2	None	None
20:00	37	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
20:00	14	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
20:00	23	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
19:00	6	Good	NO2	NO2	None	None
19:00	45	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
19:00	13	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
19:00	22	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
18:00	2	Good	NO2	NO2	None	None
18:00	47	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
18:00	13	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
18:00	22	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	47	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
17:00	13	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
17:00	22	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	39	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
16:00	13	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.