Table F2.

Recommended mean age-dependent occupancy factors for the US population (based on US EPA 2011).

Age group, in years	Indoors (total)	Indoors at residence	Indoors elsewhere	Outdoors	In vehicle
Birth to <1	0.94	0.77	0.17	0.03	0.03a
1 to <2	0.94	0.74	0.20	0.03	0.03a
2 to <3	0.91	0.68	0.23	0.05	0.04a
3 to <6	0.89	0.66	0.23	0.07	0.04a
6 to <11	0.86	0.62	0.24	0.09	0.05a
11 to <16	0.87	0.62	0.25	0.07	0.06a
16 to <21	0.87	0.58	0.29	0.07	0.06a
18 to <65	0.80	0.66	0.14	0.09	0.11b
≥65	0.79	X–	X–	0.10	0.11b

^aIncludes time spent in activities that could not be assigned to indoor or outdoor locations.

^bAssumed to be equal to the “Time Outdoors away from Residence.”