Table 2. Top 10 Species Contributing to the Calculated OH Reactivity of Adult Whole-Body Emissions (average levels and standard deviations of Experiments 1, 6, 10, and 21) under Ozone-Free and Ozone-Present Conditions.

	mass (H+)	compounds	OH reactivity ± SD (s–1)	fraction ± SD%
ozone-free	a	isoprene	12 ± 2.4	76 ± 3.8
	137.132	limonene	0.6 ± 0.1	3.6 ± 1.0
	127.112	6MHO	0.4 ± 0.1	2.6 ± 1.3
	45.034	acetaldehyde	0.3 ± 0.2	2.0 ± 0.9
	b	ammonia	0.2 ± 0.1	1.2 ± 0.5
	195.186	geranyl acetone	0.2 ± 0.1	1.1 ± 0.6
	87.044	1,4-butanedial	0.1 ± 0.0	0.9 ± 0.1
	33.034	methanol	0.1 ± 0.0	0.8 ± 0.3
	91.057	C4H10S	0.1 ± 0.1	0.7 ± 0.5
	71.049	C4H6O	0.1 ± 0.0	0.7 ± 0.2
	sum of top 10 species		14 ± 2.4	90 ± 1.6
	sum of all species		16 ± 2.3
ozone-present	a	isoprene	11.0 ± 1.2	33 ± 3.8
	127.112	6MHO	9.3 ± 1.1	28 ± 1.2
	101.096	4OPA	1.9 ± 0.2	5.8 ± 0.1
	143.143	nonanal	1.2 ± 0.1	3.5 ± 0.1
	87.044	1,4-butanedial	0.8 ± 0.1	2.5 ± 0.1
	45.034	acetaldehyde	0.8 ± 0.2	2.5 ± 0.8
	137.132	limonene	0.7 ± 0.1	2.2 ± 1.0
	141.127	nonenal	0.7 ± 0.1	2.0 ± 0.1
	a	propanal	0.6 ± 0.1	1.8 ± 0.0
	195.186	geranyl acetone	0.4 ± 0.1	1.3 ± 0.5
	sum of top 10 species		27 ± 1.4	82 ± 0.8
	sum of all species		33 ± 1.4

^aIsoprene and propanal data were obtained from fast-GC–MS.

^bAmmonia data was obtained from a cavity ring-down spectrometer (Picarro G2103).