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Assessment of tropospheric ozone at an industrial site of Chennai megacity

机译：钦奈特大城市工业区对流层臭氧的评估

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摘要

This paper presents the temporal variation in surface-level ozone (O-3) measured at Gummidipoondi near Chennai, Tamilnadu. The site chosen for the present study has high potential for ozone generation sources, such as vehicular traffic and industrial activities. The site is also located near a hazardous waste management facility. The key sources of nitrogen oxides (NOx), which are considered to be an important precursor of O-3, include hazardous waste incineration, trucks bringing the hazardous wastes, and vehicles plying on the nearby National Highway 16 (NH 16). The measurements clearly showed diurnal variation, with maximum values observed during the noon hours and minimum values observed when solar radiation was less. The data showed a marked seasonal variation in O-3, with the highest hourly average O-3 concentration (497.2 mu g/m(3)) in the summer season. Consequently, in order to identify the long-range transport sources adding to the increased O-3 levels, backward trajectories were computed using the Hybrid Single Particle Lagrangian Integrated Trajectory (HYSPLIT) model. It was found that the polluted air mass originated from the Southeast Asian region and the Indo-Gangetic Plain. The polluted air mass, which advected large amounts of carbon monoxide (CO) plumes, was analyzed using the Measurement of Pollution in the Troposphere (MOPITT) retrievals. The correlations of O-3 with temperature (r = 0.746; P 0.01) and solar radiation (r = 0.751; P 0.01) were strongly positive, and that with NOx was found to be negative. Stronger correlation of O-3 with NOx was observed during pre-monsoon months (r = 0.627; P 0.01) and following hours of photochemical reactions. There were substantial differences in concentrations between weekdays and weekends, with higher nitric oxide (NO) and nitrogen dioxide (NO2), but lower O-3, concentrations on weekdays. A substantial weekday-weekend difference in O-3, which was higher on weekends, appears to be attributable to lower daytime traffic activity and hence reduced emissions of NOx to a "NOx-saturated" atmosphere. Implications: The assessment of ground-level ozone in an industrial area with hazardous waste management facility is very important, as there is high possibility for more generation of tropospheric ozone. Since the location of the study area is coastal, wind plays a major role in O-3 transportation; hence, the effects of wind speed and wind direction have been studied in different seasons. When compared with the other studies carried out in different places across India, the present study area has recorded much greater O-3 mixing ratio. This study can be useful for setting up control strategies in such industrial areas.
机译：本文介绍了在泰米尔纳德邦钦奈附近的Gummidipoondi观测到的地表臭氧（O-3）的时空变化。选择用于本研究的地点具有产生臭氧的巨大潜力，例如车辆交通和工业活动。该场所还位于危险废物管理设施附近。被认为是O-3的重要前体的氮氧化物（NOx）的主要来源包括危险废物焚化，运送危险废物的卡车以及在附近的16国道（NH 16）上行驶的车辆。测量结果清楚地显示出昼夜变化，在中午时分观察到最大值，而在太阳辐射较少时观察到最小值。数据显示O-3的季节变化显着，夏季的O-3每小时平均最高浓度（497.2μg / m（3））。因此，为了确定增加了O-3含量的远程传输源，使用混合单粒子拉格朗日综合轨迹（HYSPLIT）模型计算了后向轨迹。发现污染的空气质量起源于东南亚地区和印度恒河平原。使用对流层污染测量（MOPITT）检索分析了平流大量一氧化碳（CO）羽流的污染空气质量。 O-3与温度（r = 0.746； P <0.01）和太阳辐射（r = 0.751； P <0.01）的相关性呈强正相关，而与NOx的相关性呈负相关。在季风前的几个月（r = 0.627； P <0.01）和随后的光化学反应小时中，观察到O-3与NOx的相关性更强。在工作日和周末之间，浓度存在显着差异，其中工作日的一氧化氮（NO）和二氧化氮（NO2）较高，而O-3的浓度较低。 O-3的工作日与周末之间存在很大的差异（周末较高），这似乎是由于白天的交通活动减少，因此减少了向“ NOx饱和”气氛的NOx排放量。含义：对具有危险废物管理设施的工业区中的地面臭氧进行评估非常重要，因为很有可能会产生更多的对流层臭氧。由于研究区域位于沿海地区，因此风在O-3的运输中起主要作用。因此，已经研究了不同季节的风速和风向的影响。与在印度各地进行的其他研究相比，本研究区域记录到的O-3混合比例更高。这项研究对于在此类工业领域建立控制策略很有用。

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    《Journal of the air & waste management association》 |2019年第9期|1079-1095|共17页
  • 作者

    Mohan S.; Saranya Packiam;

  • 作者单位

    Indian Inst Technol Madras, Dept Civil Engn, Environm & Water Resources Engn Div, Chennai 600036, Tamil Nadu, India;

    Indian Inst Technol Madras, Dept Civil Engn, Environm & Water Resources Engn Div, Chennai 600036, Tamil Nadu, India;

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