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Mahna, a small city nestled within the fertile plains of Punjab, India, occupies a geographically significant position at 30.2280°N, 74.9937°E. The surrounding landscape is predominantly flat, characteristic of the Indo-Gangetic Plain, with a gentle slope towards the southwest. This flatness contributes to limited natural dispersion of pollutants. The city’s elevation is relatively low, around 230 meters above sea level, further reducing atmospheric mixing. Mahna is not directly adjacent to any major bodies of water, though the Sutlej River flows approximately 30-40 kilometers to the south, offering limited influence on local wind patterns. The region is intensely agricultural, dominated by wheat and rice cultivation, practices that contribute to seasonal biomass burning. While Mahna itself isn’t a major industrial hub, its proximity to larger industrial areas within Punjab, such as Ludhiana, means it experiences pollutant transport. The urban-rural gradient is relatively sharp; the city is a concentrated pocket within a vast agricultural matrix. This proximity to agricultural land, combined with potential industrial fallout and limited topographical features to aid dispersion, creates a challenging environment for maintaining good air quality. Dust from agricultural activities and unpaved roads also contributes significantly to particulate matter levels.

Mahna’s air quality follows a distinct seasonal pattern. The post-monsoon period, from October to November, is typically the most polluted. The burning of rice stubble after the harvest releases massive amounts of particulate matter and other pollutants, exacerbated by calm winds and temperature inversions that trap pollutants near the ground. December and January bring cooler temperatures and frequent fog, further intensifying pollution levels and reducing visibility. These months are particularly hazardous for individuals with respiratory conditions. The spring months, February to April, see a gradual improvement as temperatures rise and winds become more frequent, dispersing pollutants. However, dust storms originating from the west can temporarily degrade air quality. The monsoon season, from July to September, offers the cleanest air. Heavy rainfall effectively washes away pollutants, and increased humidity suppresses dust. However, increased cloud cover can also lead to stagnant air conditions. May and June, the pre-monsoon months, experience rising temperatures and dry conditions, leading to a build-up of dust and pollutants. Sensitive groups – children, the elderly, and those with pre-existing respiratory or cardiovascular illnesses – should limit outdoor activity during October-January and take precautions during dust storm events.