SAN YSIDRO

Data time: 5/21/2026 8:00 PM PT

Location
Address:	198 W. San Ysidro Blvd
City:	San Diego
Latitude:	32.552824
Longitude:	-117.047345
Region:	Coastal

Air Quality Information
Pollutant	Concentration	Units of Measure
CO	0.3	PPM
PM10	52	UG/M3
PM2.5	22.8	UG/M3
NO2 PPB	7.7	PPB

Hour	AQI	Class	Program	Responsible Pollutant	Activity Caution	Risk Groups
20:00	3	Good	CO	06_CO	None	None.
20:00	48	Good	PM10	22_PM10	None	People with respiratory disease are the group most at risk.
20:00	77	Moderate	PM2.5	21_PM25	Respiratory symptoms possible in unusually sensitive individuals, possible aggravation of heart or lung disease in people with cardiopulmonary disease and older adults.	People with respiratory or heart disease, the elderly and children are the groups most at risk.
20:00	7	Good	NO2 PPB	04_TRUE NO2	None	None
19:00	3	Good	CO	06_CO	None	None.
19:00	50	Good	PM10	22_PM10	None	People with respiratory disease are the group most at risk.
19:00	78	Moderate	PM2.5	21_PM25	Respiratory symptoms possible in unusually sensitive individuals, possible aggravation of heart or lung disease in people with cardiopulmonary disease and older adults.	People with respiratory or heart disease, the elderly and children are the groups most at risk.
19:00	6	Good	NO2 PPB	04_TRUE NO2	None	None
18:00	2	Good	CO	06_CO	None	None.
18:00	52	Moderate	PM10	22_PM10	Respiratory symptoms possible in unusually sensitive individuals, possible aggravation of heart or lung disease in people with cardiopulmonary disease and older adults.	People with respiratory disease are the group most at risk.
18:00	79	Moderate	PM2.5	21_PM25	Respiratory symptoms possible in unusually sensitive individuals, possible aggravation of heart or lung disease in people with cardiopulmonary disease and older adults.	People with respiratory or heart disease, the elderly and children are the groups most at risk.
18:00	5	Good	NO2 PPB	04_TRUE NO2	None	None
17:00	2	Good	CO	06_CO	None	None.
17:00	52	Moderate	PM10	22_PM10	Respiratory symptoms possible in unusually sensitive individuals, possible aggravation of heart or lung disease in people with cardiopulmonary disease and older adults.	People with respiratory disease are the group most at risk.
17:00	80	Moderate	PM2.5	21_PM25	Respiratory symptoms possible in unusually sensitive individuals, possible aggravation of heart or lung disease in people with cardiopulmonary disease and older adults.	People with respiratory or heart disease, the elderly and children are the groups most at risk.
17:00	4	Good	NO2 PPB	04_TRUE NO2	None	None
16:00	2	Good	CO	06_CO	None	None.
16:00	53	Moderate	PM10	22_PM10	Respiratory symptoms possible in unusually sensitive individuals, possible aggravation of heart or lung disease in people with cardiopulmonary disease and older adults.	People with respiratory disease are the group most at risk.
16:00	80	Moderate	PM2.5	21_PM25	Respiratory symptoms possible in unusually sensitive individuals, possible aggravation of heart or lung disease in people with cardiopulmonary disease and older adults.	People with respiratory or heart disease, the elderly and children are the groups most at risk.
16:00	4	Good	NO2 PPB	04_TRUE NO2	None	None
15:00	2	Good	CO	06_CO	None	None.
15:00	53	Moderate	PM10	22_PM10	Respiratory symptoms possible in unusually sensitive individuals, possible aggravation of heart or lung disease in people with cardiopulmonary disease and older adults.	People with respiratory disease are the group most at risk.
15:00	80	Moderate	PM2.5	21_PM25	Respiratory symptoms possible in unusually sensitive individuals, possible aggravation of heart or lung disease in people with cardiopulmonary disease and older adults.	People with respiratory or heart disease, the elderly and children are the groups most at risk.