Ashburn

Data time: 9/24/2026 3:00 AM ET

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

Air Quality Information
Pollutant	Concentration	Units of Measure
NO2	2	PPB
Ozone	13	PPB
PM10	10	UG/M3
PM2.5	3.9	UG/M3

Historical Data Concentration

Hour	AQI	Class	Program	Responsible Pollutant	Activity Caution	Risk Groups
03:00	2	Good	NO2	NO2	None	None
03:00	12	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
03:00	9	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
03:00	22	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
02:00	3	Good	NO2	NO2	None	None
02:00	11	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
02:00	9	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
02:00	22	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
01:00	3	Good	NO2	NO2	None	None
01:00	11	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
01:00	9	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
01:00	22	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
00:00	2	Good	NO2	NO2	None	None
00:00	12	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
00:00	9	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
00:00	22	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
23:00	2	Good	NO2	NO2	None	None
23:00	9	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
22:00	3	Good	NO2	NO2	None	None
22:00	11	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.