Ashburn

Data time: 9/10/2026 2:00 AM ET

Hour	AQI	Class	Program	Responsible Pollutant	Activity Caution	Risk Groups
02:00	1	Good	NO2	NO2	None	None
02:00	37	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
02:00	15	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
02:00	38	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
01:00	0	Good	NO2	NO2	None	None
01:00	38	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
01:00	14	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
01:00	38	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
00:00	0	Good	NO2	NO2	None	None
00:00	39	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.
00:00	14	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
00:00	38	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
23:00	0	Good	NO2	NO2	None	None
23:00	14	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
22:00	0	Good	NO2	NO2	None	None
22:00	14	Good	PM10	PM10	None	People with respiratory disease are the group most at risk.
21:00	1	Good	NO2	NO2	None	None
21:00	37	Good	Ozone	Ozone	None	Children and people with asthma are the groups most at risk.