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The Impact of Ambient Aerosols on Ozone as Measured by Ultraviolet Photometry

机译：紫外光度法测量环境气溶胶对臭氧的影响

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Despite intensive control efforts spanning three decades, ground level ozone continues to exceed thernhealth-oriented National Ambient Air Quality Standard (NAAQS) in many parts of the United States. ThernU.S. EPA has identified both "reference" and "equivalent" measurement techniques in order to insure datarnuniformity on a National basis. This paper examines possible aerosol-induced bias in ambient ozonernmeasurements made via ultraviolet photometry, an "equivalent" technique currently in use at almost allrnsites nationwide required by EPA to report ozone data. Although gas phase organics have demonstrable,rnpositive effects on the UV method, little is known about the impact of fine aerosols (i.e., those in the 0.5 -rn5.0 micron range) on the technique. Two photometric monitors were collocated in Madison, Connecticutrnat a site on Long Island Sound. Both monitors were configured and operated identically with thernexception of the inlet line particle filters. One monitor was equipped with a fairly standard 5 micronrnTeflon~? filter while the other used a 0.45 micron Teflon membrane filter. Both monitors were operatedrnthroughout the summer of 2000. This paper examines the differences in ozone concentrations from therntwo monitors on a short-term (time of day) and long-term (weekly and monthly) basis. In addition tornexamining experimental results, this paper discusses implications of monitoring bias.
机译：尽管经过了三十年的深入控制，但在美国许多地区，地面臭氧仍超过以健康为导向的《国家环境空气质量标准》（NAAQS）。美国EPA已经确定了“参考”和“等效”测量技术，以确保全国范围内的数据一致性。本文研究了通过紫外光度法进行的环境臭氧测量中可能由气溶胶引起的偏差，这是美国EPA要求报告臭氧数据的全国几乎所有地点目前正在使用的一种“等效”技术。尽管气相有机物对UV方法具有明显的正作用，但对精细气溶胶（即0.5-5.0微米范围内的气溶胶）对该技术的影响知之甚少。在康乃狄克州麦迪逊市的长岛湾一处地点，安置了两台光度计监视器。除了入口管线颗粒过滤器以外，两个监测器的配置和操作均相同。一台监视器配备了相当标准的5微米特富龙？过滤器，而另一个使用0.45微米的特氟龙膜过滤器。两种监测器在2000年整个夏季都进行了操作。本文研究了这两种监测器在短期（一天中的时间）和长期（每周和每月）上臭氧浓度的差异。除了检查实验结果外，本文还讨论了监控偏差的含义。

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