A Critical Assessment of Atmospheric Visibility and Aerosol Measurements in the Eastern United States
| Autor: | C. V. Mathai, I. H. Tombach |
|---|---|
| Rok vydání: | 1987 |
| Předmět: |
Atmospheric visibility
Atmospheric Science Environmental Engineering Meteorology Instrumentation Visibility (geometry) General Engineering Air pollution Particulates medicine.disease_cause Pollution Aerosol medicine Range (statistics) General Earth and Planetary Sciences Environmental science Critical assessment General Environmental Science |
| Zdroj: | JAPCA. 37:700-707 |
| ISSN: | 0894-0630 |
| DOI: | 10.1080/08940630.1987.10466255 |
| Popis: | As part of a study examining the technical basis for a secondary national ambient air quality standard for fine particulate matter to protect visibility, we reviewed available data on atmospheric aerosol and visibility in the eastern U.S. This paper presents the results of that visibility and aerosol characterization. Analysis of airport visibility data indicates that the annual median visual ranges in the East are in the 16-25 km range. In the absence of a "reference method," limited measurements of visibility using various types of instruments provide data generally in agreement with the airport visibility estimates when a contrast threshold of 0.05 is assumed in calculating visual range from the instrumental measurements. Both long- and short-term aerosol measurements have yielded consistent results; however, because of the differences in instrumentation and laboratory analytical techniques among various studies, data often are not directly comparable. The measured annual average fine particulate matte... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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