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Lāharpur, situated in the northern Indian state of Uttar Pradesh, occupies a relatively flat expanse of the Indo-Gangetic Plain at approximately 27.72°N, 80.90°E. The city’s elevation is modest, contributing to limited natural dispersion of pollutants. This geographic setting, characterized by alluvial soils, supports intensive agriculture – primarily sugarcane and wheat – which, while economically vital, introduces particulate matter from crop residue burning and fertilizer application. Lāharpur is not directly adjacent to major rivers like the Ganges or Yamuna, but benefits from groundwater resources replenished by seasonal rainfall. The surrounding landscape is predominantly rural, transitioning to denser urban centres like Bareilly and Shahjahanpur within a 50-100km radius. This urban-rural gradient means Lāharpur experiences a degree of pollutant transport from nearby industrial activity and vehicle emissions. The lack of significant topographical features – hills or forests – hinders the flushing out of trapped air masses. The city’s layout is typical of smaller Indian towns, with a central market area and radiating residential zones, often lacking robust public transport infrastructure, leading to increased reliance on two- and three-wheeled vehicles, further exacerbating localised pollution. The flat terrain and agricultural practices combine to create conditions conducive to dust suspension and limited air circulation.

Lāharpur’s air quality follows a distinct seasonal pattern. October to February represents the most challenging period. Cooler temperatures and frequent temperature inversions trap pollutants near the ground, while the post-monsoon stubble burning from surrounding agricultural lands dramatically increases particulate matter concentrations. November and December are particularly problematic. The monsoon season, from July to September, offers temporary respite, as rainfall washes away pollutants and increased wind speeds aid dispersion. However, even during the monsoon, localised flooding can contribute to dampness and mould growth, impacting respiratory health. March to June sees rising temperatures and drier conditions, leading to increased dust levels from construction and unpaved roads. Wind patterns shift, but the overall effect is a gradual build-up of pollutants. Sensitive individuals – children, the elderly, and those with pre-existing respiratory conditions – should limit outdoor activity during the October-February period and take precautions during dustier months. Wearing masks (N95 or equivalent) is advisable during peak pollution times. Monitoring local weather reports and avoiding strenuous activity on poor air quality days is crucial for protecting respiratory health. The transition periods between seasons often see fluctuating air quality, requiring vigilance.