Table 6. Updated Tropospheric Lifetimes, τ (in Hours), for the Methyl-butenol Series with OH, O₃, NO₃, and Cl Atmospheric Oxidant Species^a,^b.

	rate coefficient(cm3 × molecule–1 × s–1)				tropospheric lifetime (h)
methyl-butenol	kOH × 1011	kO3 × 1018a	kNO3 × 1013	kCl × 1010	τOH	τO3	τNO3	τCl	τtotal
2-methyl-3-buten-2-ol	6.3219	9.55	0.1156	2.6457	3.89	41.55	50.51	105.22	3.22
3-methyl-2-buten-1-ol	14.5519	311	10.0056	4.0258	1.69	1.27	0.56	69.1	0.31
3-methyl-3-buten-1-ol	10.0419	7.29	2.7056	4.1331	2.45	54.4	2.06	67.3	1.08
2-methyl-3-buten-1-ol	5.3119	4.25	(−)	3.5131	4.63	93.4	(−)	79.1	<4.18
3-methyl-3-buten-2-ol	11.7119	62.9	(−)	(−)	2.10	6.31	(−)	(−)	<1.58

^aThis work.

^bAverage tropospheric concentrations used for calculating the lifetimes of MBOs: [OH] = 1.13 × 10⁶ radicals cm^–3,⁵⁹ [O₃] = 7 × 10¹¹ molecules cm^–3,⁶⁰ [NO₃] = 5 × 10⁸ radicals cm^–3,⁶¹ [Cl] = 10⁴ atoms cm^–3,⁶² and (−) no available data.