Ashburn

Data time: 1/4/2026 7:00 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	5	PPB
Ozone	34	PPB
PM10	15	UG/M3
PM2.5	8.6	UG/M3

Historical Data Concentration

Hour	AQI	Class	Program	Responsible Pollutant	Activity Caution	Risk Groups
19:00	5	Good	NO2	NO2	None	None
19:00	31	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
19:00	14	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
19:00	48	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
18:00	8	Good	NO2	NO2	None	None
18:00	33	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
18:00	14	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
18:00	38	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
17:00	6	Good	NO2	NO2	None	None
17:00	34	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
17:00	14	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
17:00	38	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
16:00	2	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	14	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
16:00	38	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
15:00	1	Good	NO2	NO2	None	None
15:00	36	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
15:00	15	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
15:00	38	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
14:00	1	Good	NO2	NO2	None	None
14:00	32	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
14:00	15	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.