Table 2 Average and max concentration levels (ppbv) and relative contribution (%) of each C2-C9 hydrocarbons measured in atmosphere of downtown Rome
From: The determination and role of peroxyacetil nitrate in photochemical processes in atmosphere
C 2 -C 9 | Average | Max | % |
|---|---|---|---|
Ethane | 8.3 | 18.7 | 10.5 |
Ethene | 20.4 | 126.0 | 25.7 |
Propane | 6.0 | 25.6 | 7.6 |
Propene | 3.3 | 14.4 | 4.2 |
n-Butane | 4.1 | 32.0 | 1.3 |
i-Butane | 1.1 | 27.8 | 5.2 |
1-Butene | 1.1 | 10.1 | 1.3 |
cis-2-Butene | 2.7 | 8.4 | 3.3 |
trans-2-Butene | 0.2 | 4.3 | 0.3 |
n-Pentane | 7.4 | 40.0 | 9.3 |
i-Pentane | 2.0 | 84.9 | 2.5 |
cis-2-Pentene | 0.5 | 5.5 | 0.6 |
trans-2-Pentene | 0.7 | 5.5 | 0.9 |
2-Methylpentane | 1.1 | 21.5 | 1.4 |
3-Methylpentane | 3.6 | 22.2 | 4.5 |
Isoprene | 0.2 | 1.6 | 0.2 |
n-Hexane | 0.3 | 7.9 | 0.3 |
Cyclohexane | 0.4 | 12.9 | 0.5 |
Benzene | 3.5 | 3.0 | 1.3 |
n-Heptane | 0.8 | 3.5 | 1.0 |
Toluene | 5.9 | 20.4 | 7.9 |
Ethylbenzene | 1.2 | 14.0 | 1.5 |
m- & p-Xylenes | 3.9 | 16.5 | 5.0 |
o-Xylene | 0.6 | 5.1 | 0.8 |
Styrene | 1.2 | 6.1 | 1.5 |
1,2,4-Trimethylbenzene | 0.6 | 3.4 | 0.8 |
1,3,5-Trimethylbenzene | 0.5 | 3.5 | 0.6 |
Total C 2 -C 9 | 81.6 | 544.8 | 100.0 |