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In the urban area of Bangalore, from January 2017 to March 2018, comprehensive assessments of surface-level O3, CO, NOx, CH4, NMHC, SO2, and NH3 were conducted across five distinct zones. Hourly average concentrations, accompanied by standard deviations, revealed the following values: O3(31.8 ± 17.5 μg/m3), CO (0.7 ± 0.2 μg/m3), NOx (34.6 ± 9.6 μg/m3), CH4(412.8 ± 259 μg/m3), NMHC (1.1 ± 1.1 μg/m3), SO2(4.8 ± 1.6 μg/m3), and NH3(28.8 ± 15.7 μg/m3). A noteworthy observation was the rapid surface ozone production (peaking at + 8.01 ppb/h) occurring between 8:00 am and 12:00 pm LT. This surge in ozone levels was attributed to the influx of freshly emitted precursors and photochemical reactions. Conversely, during the evening hours (between 17:00 and 19:00 h LT), a sharp decline in surface ozone (− 7.82 ppb/h) was evident, primarily due to reduced production of nitrogen oxides. When considering seasonal variations, the most significant rates of ozone increase (09.43 ppb/h) were noted in the winter season, followed by the post-monsoon (09.42 ppb/h), summer (07.78 ppb/h), and monsoon (05.38 ppb/h) periods. Conversely, the rapid destruction of surface ozone followed a similar seasonal order of winter (− 09.67 ppb/h), post-monsoon (− 08.97 ppb/h), summer (− 07.11 ppb/h), and monsoon (− 05.54 ppb/h) during morning hours (between 17:00 and 19:00 h LT). The elevated surface ozone concentrations in Bangalore City raise concerns about potential impacts on human health. In light of this, it is imperative to devise and implement measures aimed at reducing the emissions of ozone precursors in the study area.

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The Role of Precursor Gases and Meteorological Parameters on Surface O3 Over Bangalore City, Southern Part of India

  • 会议论文

  • 发表日期：

    2025年

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  • H. N. Sowmya,
  • B. T. Shivendra,
  • R. Prajwal,
  • R. Shruthi,
  • G. P. Shivashankara,
  • H. K. Ramaraju,
  • B. S. Shilpa

摘要

In the urban area of Bangalore, from January 2017 to March 2018, comprehensive assessments of surface-level O3, CO, NOx, CH4, NMHC, SO2, and NH3 were conducted across five distinct zones. Hourly average concentrations, accompanied by standard deviations, revealed the following values: O3(31.8 ± 17.5 μg/m3), CO (0.7 ± 0.2 μg/m3), NOx (34.6 ± 9.6 μg/m3), CH4(412.8 ± 259 μg/m3), NMHC (1.1 ± 1.1 μg/m3), SO2(4.8 ± 1.6 μg/m3), and NH3(28.8 ± 15.7 μg/m3). A noteworthy observation was the rapid surface ozone production (peaking at + 8.01 ppb/h) occurring between 8:00 am and 12:00 pm LT. This surge in ozone levels was attributed to the influx of freshly emitted precursors and photochemical reactions. Conversely, during the evening hours (between 17:00 and 19:00 h LT), a sharp decline in surface ozone (− 7.82 ppb/h) was evident, primarily due to reduced production of nitrogen oxides. When considering seasonal variations, the most significant rates of ozone increase (09.43 ppb/h) were noted in the winter season, followed by the post-monsoon (09.42 ppb/h), summer (07.78 ppb/h), and monsoon (05.38 ppb/h) periods. Conversely, the rapid destruction of surface ozone followed a similar seasonal order of winter (− 09.67 ppb/h), post-monsoon (− 08.97 ppb/h), summer (− 07.11 ppb/h), and monsoon (− 05.54 ppb/h) during morning hours (between 17:00 and 19:00 h LT). The elevated surface ozone concentrations in Bangalore City raise concerns about potential impacts on human health. In light of this, it is imperative to devise and implement measures aimed at reducing the emissions of ozone precursors in the study area.