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| Titel: |
An assessment of the gaseous pollutants and meteorological conditions associated with Denver's brown cloud |
| Auteur: |
Ferman, Martin A. Wolff, George T. Kelly, Nelson A. |
| Verschenen in: |
Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering |
| Paginering: | Jaargang 16 (1981) nr. 3 pagina's 315-339 |
| Jaar: |
1981 |
| Inhoud: |
During the 1978 Denver study, the General Motors mobile Atmospheric Research Laboratory was located in Commerce City, Colorado, where it monitored ambient air quality from November 8 through December 20, 1978. During this 6-week study, varying meteorology provided a wide range of pollutant conditions ranging from clean days with concentrations near background to one of the worst episodes ever observed in the Denver area. During the study, the National Ambient Air Quality Standard (NAAQS) was exceeded for CO, but not for SO2 or ozone. The average NO,, levels approached, but did not exceed, the NAAQS (annual average) concentration. Several different analyses indicate that photochemical production of ozone and aerosol occurred in Denver even on winter days with temperatures below 6CC. Maximum ambient ozone concentrations rarely were even half of the NAAQS, but significant nitrate aerosol appeared to be produced by photochemical processes. Analyses of data on total extinction indicates that absorption of light by NO2 was only a minor contributor to the reduction of visual range in Denver. Consequently, atmospheric particulate material appears to be the primary cause of visibility reduction in Denver. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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