Aneja V P, Agarwal A, Roelle P A, Phillips S B, Tong Q, Watkins N, Yablonsky R
Department of Marine, Earth and Atmospheric Sciences, North Carolina State University Raleigh, 27695-8208, USA.
Environ Int. 2001 Jul;27(1):35-42. doi: 10.1016/s0160-4120(01)00051-4.
Ambient concentrations of carbon monoxide (CO), nitrogen oxides (NOx), sulfur dioxide (SO2), and total suspended particulates (TSP) were measured from January 1997 to November 1998 in the center of downtown [the Income Tax Office (ITO) located on B.S.G. Marg] New Delhi, India. The data consist of 24-h averages of SO2, NOx, and TSP as well as 8 and 24-h averages of CO. The measurements were made in an effort to characterize air pollution in the urban environment of New Delhi and assist in the development of an air quality index. The yearly average CO, NOx, SO2, and TSP concentrations for 1997 and 1998 were found to be 4810+/-2287 and 5772+/-2116 microg/m3, 83+/-35 and 64+/-22 microg/m3, 20+/-8 and 23+/-7 microg/m3, and 409+/-110 and 365+/-100 microg/m3, respectively. In general, the maximum CO, SO2, NOx, and TSP values occurred during the winter with minimum values occurring during the summer, which can be attributed to a combination of meteorological conditions and photochemical activity in the region. The ratio of CO/NOx (approximately 50) indicates that mobile sources are the predominant contributors for these two compounds in the urban air pollution problem in New Delhi. The ratio of SO2/NOx (approximately 0.6) indicates that point sources are contributing to SO2 pollution in the city. The averaged background CO concentrations in New Delhi were also calculated (approximately 1939 microg/m3) which exceed those for Eastern USA (approximately 500 microg/m3). Further, all measured concentrations exceeded the US National Ambient Air Quality Standards (NAAQS) except for SO2. TSP was identified as exceeding the standard on the most frequent basis.
1997年1月至1998年11月期间，在印度新德里市中心[位于B.S.G. Marg的所得税办公室（ITO）]对一氧化碳（CO）、氮氧化物（NOx）、二氧化硫（SO2）和总悬浮颗粒物（TSP）的环境浓度进行了测量。数据包括SO2、NOx和TSP的24小时平均值以及CO的8小时和24小时平均值。进行这些测量是为了描述新德里城市环境中的空气污染情况，并协助制定空气质量指数。1997年和1998年的CO、NOx、SO2和TSP年平均浓度分别为4810±2287和5772±2116微克/立方米、83±35和64±22微克/立方米、20±8和23±7微克/立方米、409±110和365±100微克/立方米。一般来说，CO、SO2、NOx和TSP的最大值出现在冬季，最小值出现在夏季，这可归因于该地区气象条件和光化学活动的综合作用。CO/NOx比值（约为50）表明移动源是新德里城市空气污染问题中这两种化合物的主要贡献者。SO2/NOx比值（约为0.6）表明点源是该市SO2污染的原因。还计算了新德里的平均背景CO浓度（约为1939微克/立方米），该浓度超过了美国东部的浓度（约为500微克/立方米）。此外，除SO2外，所有测量浓度均超过了美国国家环境空气质量标准（NAAQS）。TSP被确定为最频繁超标。
