Abstract
The surface ozone levels at New Delhi, India have been reported to be consistently high in the recent years, despite several pollution control measures. The ozone levels were found to be higher than the critical value for several hours per day, along with a sharp increase in the frequency of high ozone episode days. While several studies suggested the incidences of high ozone levels due to transport from surrounding areas and in situ photochemical production, the influence of stratospheric intrusion on surface ozone levels at Delhi is yet to be studied. In the light of this observation, this chapter investigates the possibility of downward transport of ozone from the stratosphere leading to high surface ozone levels by examining two case studies in detail. It was concluded that apart from in situ photochemical production of ozone, stratospheric intrusions also contribute towards the observed transient peak in the hourly surface ozone concentration.
Published Version
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