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Tohāna, a city in Haryana, India, sits at coordinates 29.7000°N, 75.9000°E, within the Indo-Gangetic Plain. This vast, fertile expanse contributes significantly to the region’s agricultural output, but also influences air quality. The terrain is largely flat, typical of the alluvial plains formed by the ancient rivers, with a gentle slope towards the south. Tohāna’s elevation is relatively low, increasing susceptibility to temperature inversions which trap pollutants. The surrounding landscape is dominated by intensive agriculture – wheat, rice, and sugarcane are prevalent – and scattered rural settlements. While not directly adjacent to a major river, the city is within the broader watershed of the Ghaggar-Hakra river system, which historically influenced settlement patterns. The urban-rural gradient is pronounced; Tohāna serves as a market town for surrounding agricultural communities. To the south and west lie more densely populated districts, and the increasing industrial activity in areas like Panipat and Sonipat, approximately 100-150km away, contributes to regional background pollution levels that can impact Tohāna. Dust from agricultural practices, particularly during harvest seasons, is a significant local source. The lack of significant natural barriers to wind flow means pollutants can accumulate or be transported easily, depending on prevailing weather conditions.

Tohāna experiences a distinct seasonal air quality pattern. The post-monsoon period (October-November) is typically the worst, coinciding with the stubble burning season following the rice harvest. This practice releases massive amounts of particulate matter, creating a dense haze. Low wind speeds and temperature inversions during these cooler months exacerbate the problem, trapping pollutants near the ground. December and January see continued poor air quality, though often slightly improved due to occasional western disturbances bringing light rain. The summer months (April-June) bring some relief, with higher temperatures and stronger winds dispersing pollutants, though dust storms are a concern. The monsoon season (July-September) generally offers the cleanest air, as rainfall washes away pollutants and suppresses dust. However, increased humidity can also promote the formation of secondary pollutants. Sensitive groups – children, the elderly, and those with respiratory conditions – should avoid prolonged outdoor activity during October-November. March-April can also be problematic due to wheat harvesting. Monitoring local weather patterns and avoiding peak pollution times is crucial for maintaining health. Consider using air purifiers indoors during periods of high pollution.