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Chāwalhāti, a small town in the Nadia district of West Bengal, India, sits at coordinates 26.4841°N, 88.5677°E. The town’s geography is characteristic of the Ganges Delta, a low-lying, fertile alluvial plain. Elevation is minimal, generally not exceeding 15 meters above sea level, making it susceptible to seasonal flooding. Chāwalhāti is interwoven with a network of distributaries and canals branching from the Bhagirathi River, a major channel of the Ganges. This proximity to water bodies influences local humidity and temperature, but also contributes to stagnant air conditions. The surrounding landscape is predominantly agricultural, dominated by rice paddies, jute cultivation, and vegetable farming. While not a major industrial hub itself, Chāwalhāti is situated within a region experiencing increasing industrial activity in nearby Krishnanagar and Ranaghat. This creates a complex urban-rural gradient, with pollution sources emanating from both localized agricultural practices (burning of crop residue) and regional industrial emissions. The relatively flat terrain offers little natural dispersion for pollutants, and the dense population, even in this smaller town, concentrates emission sources. The town’s location within the Indo-Gangetic Plain, known for its poor air quality, further exacerbates these challenges. The urban character is typical of a West Bengal market town, with a central bazaar and surrounding residential areas.

Chāwalhāti experiences a tropical monsoon climate, defining its air quality patterns. The post-monsoon season (October-November) often sees a build-up of pollutants due to stagnant air and cooler temperatures creating temperature inversions, trapping emissions near the ground. This is worsened by the burning of agricultural waste after the harvest. Winter (December-February) brings drier conditions and further temperature inversions, leading to consistently poorer air quality, particularly in the mornings. This is a period to avoid strenuous outdoor activity, especially for those with respiratory conditions. The pre-monsoon season (March-May) sees rising temperatures and increasing dust levels, contributing to particulate matter pollution. May, before the monsoon’s arrival, is often the most challenging month. The monsoon season (June-September) provides a temporary respite, as rainfall washes away pollutants and increased humidity suppresses dust. However, increased cloud cover can also trap pollutants at lower altitudes. During the monsoon, mould and fungal spores become airborne, posing a risk to allergy sufferers. Sensitive groups – children, the elderly, and those with pre-existing respiratory or cardiovascular illnesses – should take extra precautions throughout the year, but particularly during the post-monsoon and winter months.