Sponsor: California Air Resources Board.

Overview:

The Desert Research Institute (DRI) amassed the ambient and source data necessary to address the impact of the introduction of California’s Phase 2 reformulated gasoline. Ambient and source measurements were taken of speciated hydrocarbons, oxygenated organic gases, methane, carbon monoxide, and carbon dioxide in the South Coast Air Basin during 1995 and 1996. DRI developed the sampling design, certified the samplers, analyzed hydrocarbon, and oxygenated organic compounds, and performed quality assurance, data validation, and general project management.

The Collection and Laboratory Analysis of Hydrocarbon and Carbonyl Samples at Surface Sites and Aloft During the 1996 Paso del Norte Ozone Study.

Sponsor: U.S. Environmental Protection Agency.

Overview:

Air quality sampling and analysis services were provided by DRI including 6 liter and 3 liter canisters, DNPH-cartridges, and sampling equipment for two ground-level sites and for the aircraft used in the Paso del Norte border area study (El Paso, Texas; Ciudad Juarez, Chihuahua, and Sunland Park, Mexico).

Northern Front Range Air Quality Study

Sponsor: Colorado State University.

Overview:

The purpose of this study is to determine the sources of existing air pollution in the Denver urban region, including an emission estimate for each source or source category. DRI will be responsible for developing source profiles, determining source apportionment of carbonaceous particles, for preparation and certification of aerosol sampling equipment, for preparation and analysis of aerosol filter and solid adsorbent substrates, for data validation and management, project coordination, and reporting. The study will be completed in 1996-1997.

Characterization of Motor Vehicle Emissions

Sponsor: U.S. Environmental Protection Agency.

Overview:

Several classes of particulate and gaseous organic compounds were sampled and measured in exhaust from gasoline and diesel vehicles. Ambient roadside and tunnel emissions were also sampled and an alyzed. The resulting chemical profiles are being evaluated according to their ability to distinguish diesel and gasoline vehicles using Chemical Mass Balance receptor modeling. Ambient samples will also be used to evaluate the influence of reactivity factors on these source profiles.

Laboratory Testing for Hazardous Air Pollutants

Sponsor:Arizona Department of Environmental Quality.

Overview:

Samples to measure volatile and semi-volatile organic compounds are collected by the Arizona Department of Environmental Quality at six sites in Mexico and Arizona. Samples are analyzed for volatile and semi-volatile hazardous organic compounds. Data are maintained in database format and include combined estimates of uncertainty for each value.

The Analysis of Hydrocarbon and Carbonyl Samples Collected during Ozone Precursor Monitoring in Phoenix, Arizona.

Sponsor:Arizona Department of Environmental Quality.

Overview:

DRI provided sampling equipment and laboratory analytical services for an ozone precursor monitoring program conducted in Phoenix, Arizona during 1996.

Composition and Concentration of Semi-Volatile Hydrocarbons

Sponsor:California Air Resources Board.

Overview:

The study determined the composition and concentrations of ambient, semi-volatile hydrocarbons at three locations representative of three different emission sources. The study also determined the relative contributions of the identified hydrocarbons to total gas-phase non-methane hydrocarbons.

Mechanistic Studies of Important Biogenic VOC Species

Sponsor:Coordinating Research Council.

Overview:

The study was designed to increase the understanding of the chemical and physical mechanism involved in the conversion of biogenic VOC species to organic aerosol in urban and rural atmospheres.

Collection of In-Use Mobile Source Emissions Samples for Toxicity Testing