Air quality model evaluation data for organics. 5: C6-C22 non-polar and semipolar aromatic compounds

Article Abstract:

Air sampling studies were conducted on a particularly severe Los Angeles photochemical smog episode to determine the air transport characteristics of 86 non-polar and semipolar aromatic compounds. Data showed a relationship that showed the concentration of the polyaromatic hydrocarbons (PAH) decreasing as the number of aromatic rings increases. Primary aromatics were found to decrease in concentration as sampling proceeds downwind, while nitro-PAH and oxy-PAH followed a reverse trend. The trends are governed by the subsititution in the PAHs during their downwind transport.

Industrial Organic Chemicals, Cyclic Crude and Intermediate Manufacturing, Aromatic Hydrocarbons, Hydrocarbon research, Aromatic compounds

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Bulk chemical composition and gas/particle distribution factors

Article Abstract:

The identity and concentration of the individual organic compounds present in both the gas and particle phases during the worst photochemical smog episode in the South Coast Air Basin surrounding Los Angeles, CA, from Sep. 8-9, 1993, were obtained. The data will be useful in future tests of air quality models for the study of organic air pollutant transport and reaction. High concentrations of ozone and nitrogen were observed during the field measurements conducted at a five-station air monitoring network.

Los Angeles, California, Environmental monitoring

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Detection of excess ammonia emissions from in-use vehicles and the implications for fine particle control

Article Abstract:

An estimation of the emission rate for ammonia from in-use vehicles yielded an average ammonia emission rate of 72 mg/km for vehicles using the three-way catalyst or the three-way catalyst plus oxidizing catalyst equipment. This figure results in an increase in the ammonia emissions from vehicles in the Los Angeles area from 2% prior to the introduction of catalyst-equipped automobiles, to 15%.

Motor vehicle parts and accessories, All Other Motor Vehicle Parts Manufacturing, Catalytic Converters (Auto), Automobiles, Ammonia, Motor vehicles, Catalytic converters, Automotive pollution control equipment

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