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Kosamba, Gujarat, situated at approximately 21.48°N, 72.95°E, occupies a geographically significant position within the broader landscape of western India. The town lies within the fertile plains of Gujarat, a region characterized by a gently undulating terrain and predominantly alluvial soil, ideal for agriculture. Its location is strategically important as it sits near the Bharuch district, a key industrial hub and part of the larger Ankleshwar-Panoli industrial belt, a major contributor to Gujarat’s economic output. This proximity presents a dual edge: the agricultural lands surrounding Kosamba support a rural economy, while the nearby industrial zone introduces potential sources of air pollution. The elevation is relatively low, averaging around 25 meters above sea level, which can exacerbate the trapping of pollutants, particularly during periods of atmospheric stability. The landscape is largely flat, transitioning from agricultural fields of cotton, groundnut, and pulses to the more industrialized areas to the east. While Kosamba itself lacks direct access to major bodies of water, the Narmada River flows relatively close by, influencing local climate patterns and potentially impacting regional air circulation. The urban–rural gradient is noticeable, with Kosamba exhibiting a mix of traditional village structures and increasingly modern residential areas, reflecting its evolving character as a growing town influenced by the nearby industrial activity and the broader urbanization trends in Gujarat. This interplay of agricultural and industrial influences significantly shapes the local air quality profile.

Kosamba’s air quality experiences a distinct seasonal cycle dictated by Gujarat’s climate. The dry, cooler months of November to February typically see the poorest air quality. Temperature inversions, common during this period, trap pollutants close to the ground, intensifying their impact. Agricultural burning, a practice used to clear fields after harvest, contributes significantly to particulate matter pollution during these months, particularly in late November and December. January and February often experience dense fog, further reducing visibility and hindering pollutant dispersion. Conversely, the monsoon season (June to September) brings relief, with frequent rainfall washing away pollutants and strong winds dispersing them. The increased humidity also reduces the concentration of particulate matter. The pre-monsoon months (March-May) are characterized by rising temperatures and increasing dust levels, often exacerbated by construction activities and vehicular emissions. The summer months are generally drier than the pre-monsoon period, but the increased wind speeds can sometimes aid in pollutant dispersal. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the winter months, limiting outdoor exposure and avoiding strenuous activity. During agricultural burning periods, wearing masks and staying indoors when possible is advisable. The monsoon offers a period of respite, but even then, localized pollution from industrial sources can still occur. Maintaining awareness of prevailing wind conditions and minimizing exposure during periods of stagnant air is crucial for protecting respiratory health.