EPA-93-FA11-03-A070

093

3,650 千元

2004/06/14

2005/03/31

張時禹

空保處

國立中央大學大氣物理研究所

化學物質管理

光化評估測站監測,模式模擬,風險評估,,,

PAMS observation,Model Simulation,Risk Analysis

詹長權,王家麟,劉遵賢

許書維

03-4275166 etc65539

gary119@rias.atm.ncu.edu.tw

蒐集2002年與2003年光化評估測站VOCs基本資料，以及中部地區臭氧及其前驅物的相關觀測資料，並與環保署空品站的NOx、臭氧、風速、風向、輻射儀等既有的監測資料，相互比較、對照分析其中光化現象並與模式相互搭配找出成因，以提供政府擬定管制策略時之參考。 中部地區崇倫、草屯、竹山三個光化評估測站的非甲烷碳氫化合物觀測包含56種。取用的觀測資料顯示，甲苯或是異戊二烯之測值10月皆較6月時要低，但臭氧的濃度仍然是10月比6月高，顯示這些污染物的濃度高低或是光化反應強度皆不足以完全解釋觀測到的臭氧濃度，必須輔以其他的資料（氣象資料）及模式模擬才能做進一步的解釋。 選定2002年6月與10月分別代表低與高臭氧時期的代表月份，利用TAQM針對中部空品區進行模擬，並相互比較與分析各種有可能會影響臭氧濃度的因子及其影響程度。各種影響臭氧的因數中，氣流的來向主導著中部地區空氣品質的狀況，當台灣地區在秋季吹偏北東的風時，中部地區受尾流效應影響，易有海陸風循環的現象發生，極易造成空氣污染事件。 在風險評估分析方面，台灣地區揮發性有機污染物中，苯的危害性較大，不過基本上並不會有急性健康效應的發生，但在慢性致癌風險方面，有部份濃度較高的地區值得注意。

光化評估測站監測,模式模擬,風險評估,,,

00001116171.pdf

27MB

[期末報告]公開完整版

2006/1/1 上午 12:00:00

The object of this project is to explore ozone problem with data of Photochemical Assessment Monitoring Stations (PAMS) in Central Taiwan, and to identify the causes of high ozone concentration by means of air quality model simulation. Two periods of interest during 2002 were selected to represent high (October) and low (June) ozone episodes. Data of ozone and its precursor collected in PAMS in Central Taiwan were compared with corresponding EPA data and model simulations. NMHC observations with PAMS stations at Tsongneng, Tsoutuen, and Jusan include 56 VOCs. Observation data shows that benzene and isoprene values were lower in October than in June. But ozone concentrations are yet higher in October than in June. This indicates that amount of pollutants and intensities of photochemical processes are not sufficient to explain the formation of ozone in this region. Other data such as meteorological variables and model simulations results must be used. TAQM simulations were performed using 2002 June and October as representative low and high ozone episodes. Analysis of these simulation results compared several parameters for ozone formation and the level of impacts. Among those considered, direction of air flow appears to be the principal control parameter for air quality in Central Taiwan. For the autumnal northeasterly air flow, Central Taiwan is strongly affected by vortex entrapment on the lee side of the mountains. Land-sea flow reversal further adds to the build up of ozone and precursors. Our risk analysis shows that benzene appears to be the most harmful among all the observed VOCs in Taiwan. Overall, there does not appear to be any risk for acute health effect. However there are limited areas with potential for chronic exposures that may lead to cancer.

PAMS observation,Model Simulation,Risk Analysis