37 Microenvironments

Note: EPA no longer updates this information, but it may be useful as a reference or resource.

Code	Microenvironment		Code	Microenvironment
	General	Specific		General	Specific
1	In vehicle	Car	19	Indoors	Restaurant
2	In vehicle	Bus	20	Indoors	Manufacturing facility
3	In vehicle	Truck	21	Indoors	School
4	In vehicle	Other	22	Indoors	Church
5	Indoors	Public garage	23	Indoors	Shopping mall
6	Outdoors	Parking lot/ garage	24	Indoors	Auditorium
7	Outdoors	Near road	25	Indoors	Health care facility
8	Outdoors	Motorcycle	26	Indoors	Other public building
9	Indoors	Service station	27	Indoors	Other location
10	Outdoors	Service station	28	Indoors	Not specified
11	Indoors	Residential garage	29	Outdoors	Construction site
12	Indoors	Other repair shop	30	Outdoors	Residential grounds
13	Indoors	Residence - no CO source	31	Outdoors	School grounds
14	Indoors	Residence - gas stove	32	Outdoors	Sports arena
15	Indoors	Residence - attached garage	33	Outdoors	Park/golf course
16	Indoors	Residential - stove and garage	34	Outdoors	Other location
17	Indoors	Office	35	Outdoors	Not specified
18	Indoors	Store	36	In vehicle	Train/subway
			37	In vehicle	Airplane