Table 2.

Two-box model, 2-BE estimated AM concentrations for near field and far field.

Wind speeda	Surface areab	ACHc	Room sized	2-BE TWA AM (ppb) Near fieldd			2-BE TWA AM (ppb) Far fieldd
				5 min	10 min	15 min	5 min	10 min	15 min
Low	Small	Low	Small	1160	1560	1880	437	819	1137
Low	Small	Low	Large	839	939	1010	98.1	188	264
Low	Medium	Low	Small	3520	4710	5730	1320	2480	3480
Low	Medium	Low	Large	2580	2890	3090	301	578	805
Low	Small	Medium	Small	1130	1450	1710	405	717	967
Low	Small	Medium	Large	822	907	966	90.1	162	219
Low	Medium	Medium	Small	3520	4530	5170	1260	2240	2930
Low	Medium	Medium	Large	2530	2790	2940	278	500	667

ppb, parts per billion; TWA, time-weighted average.

^a Low wind ranged from 3.75 to 26.8 m min⁻¹.

^b Small surface areas ranged from 25.8 to 232.3 cm² and medium surface areas ranged from 412.9 to 929.0 cm².

^c Low ACH ranged from 1 to 3, medium ranged from 3 to 6 ACH.

^d The near field small room size was 0.76, 0.76, and 1 m (2.5 by 2.5 by 3.3 ft). The far field small room size was 3 × 3 × 3 m (27 m³) and the far field large room size was 5 × 5 × 5 m (125 m³).