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Kharak Kalān, nestled in Haryana, India (28.8070° N, 76.3140° E), occupies a geographically significant position within the Indo-Gangetic Plain. This expansive, fertile region is characterized by its alluvial soil, a legacy of the ancient Ghaggar-Hakra river system, and a remarkably flat terrain with an average elevation of around 218 meters (715 feet). The city’s location, approximately 130 kilometers southwest of Delhi, places it within the sphere of influence of the National Capital Region (NCR), a sprawling urban agglomeration. The surrounding landscape is predominantly agricultural, with vast fields of wheat, rice, and sugarcane dominating the horizon. This intensive agricultural activity, coupled with the prevalence of crop residue burning after harvest, contributes significantly to regional air pollution. Kharak Kalān exhibits a gradual urban–rural gradient; while retaining a distinctly rural character, it experiences increasing pressure from urban expansion due to its proximity to larger urban centers. The city’s relatively isolated location, away from major river systems, means it lacks the natural air cleansing effects associated with large bodies of water. Furthermore, the prevailing westerly winds, common across the Indo-Gangetic Plain, can transport pollutants from industrial belts in neighboring states, exacerbating local air quality challenges. The flat topography inhibits atmospheric dispersion, leading to pollutant accumulation, particularly during periods of stagnant air. The region's climate, characterized by hot summers and cool winters, further influences air quality dynamics.

Kharak Kalān’s air quality follows a distinct seasonal pattern dictated by meteorological conditions and regional activities. The dry, cool months of October through February present the most challenging period. Following the monsoon withdrawal, agricultural residue burning intensifies dramatically, releasing vast quantities of particulate matter into the atmosphere. Temperature inversions, common during these months, trap pollutants near the ground, leading to prolonged periods of poor air quality. Fog, frequently occurring due to high humidity and low temperatures, further restricts visibility and exacerbates the impact of pollutants. March to May marks the transition to the pre-monsoon season, characterized by rising temperatures and increased dust storms originating from the Thar Desert. While residue burning diminishes, dust and construction activities contribute to elevated particulate levels. The monsoon season, typically from June to September, brings relief as rainfall washes away pollutants and strong winds disperse them. However, heavy rainfall can also lead to localized flooding and increased humidity, potentially impacting respiratory health. The post-monsoon period, September and October, sees a gradual return to drier conditions, with a slow build-up of pollutants as agricultural activities resume. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the dry winter months, limiting outdoor exposure and using air purifiers when possible. During the pre-monsoon season, staying indoors during dust storms is advisable. Maintaining awareness of regional air quality forecasts and adhering to public health advisories is crucial for minimizing health risks.