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Lālgola, a municipality in Murshidabad district, West Bengal, India, occupies a geographically significant position within the Ganges Delta. Located at approximately 24.42°N latitude and 88.25°E longitude, the city sits on the eastern bank of the Bhagirathi River, a major distributary of the Ganges. The terrain is remarkably flat, characteristic of the deltaic plains, with an elevation barely above sea level, making it vulnerable to flooding. Surrounding Lālgola is a predominantly agricultural landscape, dominated by rice cultivation, jute farming, and fruit orchards. This intensive agriculture contributes to seasonal biomass burning, impacting local air quality. The urban-rural gradient is relatively sharp; Lālgola itself is a concentrated urban centre, but quickly transitions to rural villages and farmland. Its proximity to the Bhagirathi, while providing a vital water source, also limits atmospheric dispersion of pollutants. The region experiences high humidity for much of the year. Further inland, towards the north and west, lie more densely populated areas and emerging industrial activity in Murshidabad, potentially contributing to regional pollution transport. The delta’s complex hydrological network and low-lying topography exacerbate the impact of any emissions, hindering natural cleansing processes.

Lālgola’s air quality follows a distinct seasonal pattern heavily influenced by the monsoon and post-monsoon periods. The pre-monsoon months (March-May) witness a gradual deterioration in air quality due to rising temperatures and stagnant air, creating conditions for temperature inversions that trap pollutants near the ground. Agricultural residue burning after the harvest further exacerbates the situation, peaking in April. The arrival of the monsoon (June-September) brings a temporary respite, as rainfall effectively washes away particulate matter and increased humidity suppresses dust. However, increased cloud cover can also trap pollutants at lower altitudes. Post-monsoon (October-November) sees a resurgence of pollution, driven by cooler temperatures, calmer winds, and the burning of crop stubble for the next planting season. This is often the most challenging period for respiratory health. Winter (December-February) brings drier conditions and potential for fog formation, trapping pollutants and reducing visibility. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit outdoor activity during the pre-monsoon and post-monsoon seasons. Monitoring local weather patterns and avoiding peak pollution times is crucial for protecting health.