Visibility and atmospheric aerosol properties in Central Taiwan
Visibility data over the past 40 years monitored in the urban area in central Taiwan indicated that visibility in recent years was significantly degraded by air pollutants. Nowadays annual average visibility in the urban area is approximately 8--10 km while the visibility in the remote area is about 25--30 km. In order to understand how the background aerosols affecting the visibility in this area, a remote site located at 2,413 meters altitude in the Mt. Ali was chosen to measure the soluble ionic and the carbonaceous species of PM{sub 2.5} and PM{sub 2.5-10} during the autumn season 1998. The size distributions of the atmospheric sulfate, nitrate, and carbonaceous particles were measured by MOUDI (Micro-Orifice Uniform Deposit Impactor). The aerosol data were then analyzed together with the meteorological and the air quality data. By comparing the results obtained from the urban, the coastal suburban and the remote sites, it showed that the sulfate, the carbonaceous species and the local wind speed are the major factors affecting the visibility in the urban area. However, the visibility in the coastal area was influenced by sulfate concentration and humidity. The particulate concentration in the remote station is roughly one-fifth of those in the city. During the smoggy days, more nitrate and carbonaceous particles indicated that the traffic emissions influenced the visibility in the urban area.
- Research Organization:
- National Chung Hsing Univ., Taichung (TW)
- OSTI ID:
- 20006507
- Report Number(s):
- CONF-990608-; TRN: IM200008%%114
- Resource Relation:
- Conference: Air and Waste 92nd Annual Meeting and Exhibition, St. Louis, MO (US), 06/20/1999--06/24/1999; Other Information: 1 CD-ROM. Operating Systems: Windows 3.1, '95, '98 and NT; Macintosh; and UNIX; PBD: 1999; Related Information: In: Air and Waste 92nd annual meeting and exhibition proceedings, [9500] pages.
- Country of Publication:
- United States
- Language:
- English
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