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Science 18 August 1995:
Vol. 269. no. 5226, pp. 953 - 956
DOI: 10.1126/science.269.5226.953
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Articles

Urban Leakage of Liquefied Petroleum Gas and Its Impact on Mexico City Air Quality

Donald R. Blake 1 and F. Sherwood Rowland 1

1 Department of Chemistry, University of California, Irvine, CA 92717, USA.

Alkane hydrocarbons (propane, isobutane, and n-butane) from liquefied petroleum gas (LPG) are present in major quantities throughout Mexico City air because of leakage of the unburned gas from numerous urban sources. These hydrocarbons, together with olefinic minor LPG components, furnish substantial amounts of hydroxyl radical reactivity, a major precursor to formation of the ozone component of urban smog. The combined processes of unburned leakage and incomplete combustion of LPG play a significant role in causing the excessive ozone characteristic of Mexico City. Reductions in ozone levels should be possible through changes in LPG composition and lowered rates of leakage.

Submitted on April 28, 1995
Accepted on July 20, 1995


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