Characterization of a spatial gradient of nitrogen dioxide across a United States-Mexico border city during winter
Characterization of a spatial gradient of nitrogen dioxide across a United States-Mexico border city during winter
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DOI：
10.1016/j.scitotenv.2004.07.010
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发表时间：
2005-01-20
影响因子：
9.8
通讯作者：
Neas, L
中科院分区：
文献类型：
--
作者：
Gonzales, M;Qualls, C;Neas, L
环境二氧化氮(NO2)浓度的梯度在美国德克萨斯州埃尔帕索大都市显示，这座城市位于美国和墨西哥之间的国际边界上。在典型的冬季大气条件下，在全市20所小学和4个空气质量监测站收集了7天的NO2综合测量数据。复制被动监测仪与化学发光分析仪一起放置在监测站，连续两个7天的时间段。被动测量与分析仪测量相关(R2=0.74)，精密度为2.5+/-2.2 ppb。二氧化氮浓度介乎11.0至37.5 ppb(平均20.6+/-7.1 ppb)。在多元回归模型中，场地高程和从墨西哥到一条主要公路和国际入境口岸的距离解释了被动测量中81%的差异。这项初步研究的结果表明，接近与车辆有关的NO2源和场地海拔是未来对埃尔帕索地区与车辆有关的空气污染暴露进行更详细评估的关键预测因素。(C)2004爱思唯尔B.V.保留所有权利。
A gradient of ambient nitrogen dioxide (NO2) Concentration is demonstrated across metropolitan El Paso, Texas (USA), a city located on the international border between the United States and Mexico. Integrated measurements of NO2 were collected over 7 days at 20 elementary schools and 4 air quality monitoring stations located throughout the city during typical winter atmospheric conditions. Replicate passive monitors were co-located with chemiluminescence analyzers at the monitoring stations for two consecutive 7-day periods. The passive measurements correlated with the analyzer measurements (R-2 = 0.74) with precision of 2.5 +/- 2.2 ppb. Nitrogen dioxide concentrations ranged from 11.0 to 37.5 ppb (mean 20.6 +/- 7.1 ppb). In a multivariate regression model, the site elevation and distances to a main highway and to an international port of entry from Mexico explained 81% of the variance in the passive measurements. The results of this pilot study indicate that proximity to vehicle-related sources of NO2 and site elevation are key predictors for future, more detailed assessments of vehicle-related air pollution exposure in the El Paso region. (C) 2004 Elsevier B.V. All rights reserved.