Ashburn

Data time: 4/30/2026 5:00 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	27	PPB
PM10	11	UG/M3
PM2.5	4.2	UG/M3

Historical Data Concentration

Hour	AQI	Class	Program	Responsible Pollutant	Activity Caution	Risk Groups
05:00	2	Good	NO2	NO2	None	None
05:00	25	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
05:00	10	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
05:00	23	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
04:00	2	Good	NO2	NO2	None	None
04:00	24	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
04:00	10	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
04:00	23	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
03:00	1	Good	NO2	NO2	None	None
03:00	21	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
03:00	10	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	1	Good	NO2	NO2	None	None
02:00	19	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
02:00	10	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	14	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
01:00	10	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
01:00	25	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
00:00	8	Good	NO2	NO2	None	None
00:00	20	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
00:00	10	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.