Evaluating Sources of Air Pollution

Abstract

Titanium and zirconium give zero or negligible corrosion rates in air aerated aniline hydrochloride solutions. Stainless steel is unsatisfactory because of a tendency to form deep pits. The three materials are resistant to boiling chlorinated hydrocarbonwater mixtures. With the exception of stainless steel in carbon tetrachloride, these materials also have little or no catalytic effect on the decomposition of the hydrocarbon under such conditions. LITERATURE CITED(1) Am. Soc. Testing Materials, Standards, Pt. I-B, 793-802 (1946), (2) Corrosion Handbook ( . H. Uhlig, ed.

Vehicle Emissions and Air Quality: The Early Years (1940s–1950s)

“…Other large hydrocarbon sources included refineries, industries using volatile solvents, and the numerous private garbage incinerators that were still in existence at that time. In an early assessment of emission sources in Los Angeles County, the LACAPCD estimated total hydrocarbon emissions in 1951 to be 2180 tons/day, with gasoline vehicles being responsible for about 40% of this total [15]. Total NOx emissions were estimated at 255 tons/day, with gasoline vehicles being responsible for about 50% of the total.…”

“…It was speculated that the lower smog levels during weekends (especially Sundays) was related to both reduced industrial activity and changes in traffic patterns-in particular, reduced work commute driving. In 1953, the LACAPCD summarized results from their monitoring of air pollutant concentrations over an extended period of time [15]. As shown in Table 2, dramatic differences in pollutant concentration were observed on "good visibility" days and "intense smog" days.…”

“…To understand the vertical distribution of smog, air sampling was also conducted at various heights using a U.S. In 1953, the LACAPCD summarized results from their monitoring of air pollutant concentrations over an extended period of time [15]. As shown in Table 2, dramatic differences in pollutant concentration were observed on "good visibility" days and "intense smog" days.…”

“…The LACAPCD estimated that in 1940, total hydrocarbon emissions in LA County were 2810 tons/day, with over one-half of this attributed to the production, refining, marketing, and automotive use of petroleum products [15]. A survey conducted by the Western Oil and Gas Association (WOGA) determined that of these fuel/vehicle emissions, 70% came from exhaust emissions, 19% from refining and marketing activities, and 11% from vehicle evaporative emissions.…”