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Ambala, a city in Haryana, India, occupies a strategically important location in the Indo-Gangetic Plain, approximately 200 kilometers north of Delhi. Its coordinates (30.3800, 76.7800) place it within a relatively flat terrain, characteristic of the region, with an average elevation of around 280 meters. The surrounding landscape is predominantly agricultural, a patchwork of fertile fields cultivated with wheat, rice, and sugarcane, contributing to seasonal biomass burning. To the east, the Shivalik Hills begin to rise, influencing local wind patterns and potentially trapping pollutants under certain meteorological conditions. The city sits near the Ghaggar River, though its influence on Ambala’s immediate microclimate is limited; the river’s flow is often intermittent. Ambala’s urban character is a blend of historical significance – it served as a cantonment town during British rule – and modern development. This has resulted in a mix of older, denser residential areas and newer, planned zones. The urban–rural gradient is relatively sharp, with agricultural land quickly surrounding the city limits. The proximity to industrial belts in nearby regions, particularly those focused on manufacturing and processing, contributes to regional air pollution that can impact Ambala. The city’s location within the broader Indo-Gangetic Plain, a densely populated and industrialized area, inherently makes it susceptible to transboundary pollution events. The relatively low elevation and flat topography can exacerbate the accumulation of pollutants, especially during periods of stagnant air. The prevailing westerly winds, while generally dispersing pollutants, can also carry them from upstream sources.

Ambala’s air quality follows a distinct seasonal pattern dictated by meteorological factors and regional agricultural practices. The winter months (November to February) consistently present the most challenging conditions. Cold temperatures frequently lead to temperature inversions, where a layer of warm air traps cooler air and pollutants near the ground, resulting in stagnant air and elevated concentrations. Dense fog, a common occurrence during this period, further restricts dispersion. Agricultural burning, a widespread practice after the harvest of rice and before the planting of wheat, significantly contributes to particulate matter pollution. Spring (March-May) sees a gradual improvement as temperatures rise and winds increase, aiding in pollutant dispersal. However, dust storms originating from the Thar Desert can occasionally impact air quality. The monsoon season (June to September) brings relief, with rainfall washing away pollutants and increased wind speeds facilitating their removal. However, heavy rainfall can also lead to localized flooding and associated issues. The post-monsoon period (October) often experiences a brief return to poorer air quality as agricultural burning resumes in preparation for the winter crop. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the winter months, limiting outdoor activities during peak pollution episodes. During the winter, indoor air quality is also a concern, and using air purifiers and ensuring proper ventilation can be beneficial. Maintaining awareness of regional pollution forecasts and adhering to public health advisories is crucial throughout the year.