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Spatio-temporal variability and canonical seasonal regimes of tropospheric NO2 across India’s non-attainment cities: Insights from TROPOMI, ERA5 meteorology, and trend sensitivity analysis
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DOI：10.1016/j.jag.2026.105319.png)
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Abstract
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• TROPOMI observations reveal strong winter maxima and monsoon minima of NO2 across NCAP cities. • Persistent NO2 hotspots align with major urban–industrial corridors and coal-based regions. • Five canonical seasonal regimes identified, capturing structurally distinct NO2 behaviour. • Trends are largely weak and stable, with ∼ 91–99% cities insensitive to COVID-related perturbations. • Meteorological controls show strong precipitation-driven scavenging and wind-induced dispersion effects..
Keywords:
Tropospheric NO2
TROPOMI
Seasonal variability
Meteorological controls
ERA5 reanalysis
Canonical seasonal regimes
India
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