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Egra, a municipality in the Purba Medinipur district of West Bengal, India, occupies a relatively low-lying position within the Ganges Delta. Situated at coordinates 21.9000°N, 87.5300°E, the city’s terrain is predominantly flat alluvial plains, characteristic of the region. This flatness contributes to limited natural dispersion of pollutants. Egra is approximately 15km inland from the Bay of Bengal, meaning coastal breezes can offer some, albeit intermittent, relief from stagnant air. The surrounding landscape is a mosaic of intensely cultivated agricultural land – primarily rice paddies – interspersed with small settlements and patches of mangrove forest closer to the coast. While not a major industrial hub itself, Egra is within reach of industrial areas further north towards Kolkata and Haldia, potentially receiving transported pollutants. The urban-rural gradient is quite sharp; the city centre is densely populated, transitioning rapidly to agricultural fields. This proximity to agricultural practices introduces sources of particulate matter from crop residue burning and fertilizer use. The lack of significant elevation and the humid, often stagnant, air contribute to a propensity for pollutant build-up, particularly during calmer weather conditions. The city’s drainage systems, crucial in a deltaic environment, also influence localised air quality through dust suspension during drier periods.

Egra’s air quality follows a distinct seasonal pattern dictated by the monsoon and post-monsoon weather systems. The pre-monsoon months of March to May are typically the worst for air quality. Rising temperatures create unstable atmospheric conditions, but limited rainfall means pollutants accumulate. Hot, dry winds from the west can carry dust and pollutants from inland areas. The arrival of the southwest monsoon in June brings a temporary respite, as rainfall effectively washes particulate matter from the air. However, increased humidity can also foster mould growth, impacting respiratory health. Post-monsoon, from October to November, sees a resurgence in pollution. Cooler temperatures lead to temperature inversions, trapping pollutants near the ground. This period coincides with increased agricultural burning as farmers prepare fields for the next crop, significantly elevating particulate matter levels. Winter, from December to February, often features calm conditions and fog, exacerbating pollution. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during March-May and October-November. Avoiding peak traffic hours and using masks when outdoors are recommended precautions throughout the year, but especially during these periods.