Bryan Park

Data time: 1/20/2026 4:00 AM ET

Hour	AQI	Class	Program	Responsible Pollutant	Activity Caution	Risk Groups
04:00	2	Good	CO	CO	None	People with heart disease are the group most at risk.
04:00	5	Good	NO2	NO2	None	None
04:00	19	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
03:00	2	Good	CO	CO	None	People with heart disease are the group most at risk.
03:00	6	Good	NO2	NO2	None	None
03:00	20	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	CO	CO	None	People with heart disease are the group most at risk.
02:00	8	Good	NO2	NO2	None	None
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	CO	CO	None	People with heart disease are the group most at risk.
01:00	23	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
00:00	3	Good	CO	CO	None	People with heart disease are the group most at risk.
00:00	8	Good	NO2	NO2	None	None
00:00	25	Good	PM2.5	PM2.5	None	People with respiratory or heart disease, the elderly and children are the groups most at risk.
23:00	3	Good	CO	CO	None	People with heart disease are the group most at risk.