Abstract
AbstractBoundary layer ozone (BLO3) over the Indian subcontinent (IS) can be region‐specific with consequences to health and pollution management strategies. The Goddard Earth Observing System‐Chemistry (GEOS‐Chem) model was used to estimate the contributions of eight IS regions on each other for BLO3. BLO3 in northern India, Pakistan, and Sri Lanka is mostly (~65‐70%) influenced by regions outside the subcontinent. Roughly 30% of BLO3 over eastern India is from within the IS, mostly from the Indo‐Gangetic Plain and central India (CI). Southern India is influenced by CI; however, it hardly influences other regions. Northern India and Sri Lanka regions are essentially isolated from other regions in the IS. The meteorology is the primary factor in the redistribution of BLO3 and its precursors. Our results highlight the emerging importance of CI to O3 pollution in addition to the Indo‐Gangetic Plain and shed light on potential strategies for O3 control in the IS.
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