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Sānderao, a small city nestled in the southwestern part of Rajasthan, India, occupies a unique geographic position within the Aravalli Range foothills. Located at 25.1800°N latitude and 73.1000°E longitude, the city’s terrain is characterised by undulating plains and low-lying hills, typical of the region’s transition zone. The surrounding landscape is predominantly rural, dominated by agricultural lands cultivating crops like cotton, wheat, and pulses. While not directly adjacent to a major body of water, the city lies within the broader catchment area of several seasonal rivers and streams originating in the Aravallis. This proximity, while providing some irrigation, also contributes to localised humidity fluctuations. Sānderao isn’t a major industrial hub, but smaller-scale stone crushing and agricultural processing units operate in the vicinity, contributing to particulate matter emissions. The urban-rural gradient is quite sharp; the city centre is relatively compact, quickly giving way to agricultural fields and sparsely populated villages. This configuration impacts air dispersion, as pollutants generated within the city have limited opportunity to dilute before encountering surrounding rural areas. The prevailing winds, influenced by the monsoon patterns and regional topography, play a crucial role in pollutant transport and accumulation, often channeling emissions along specific corridors. The elevation, though not high, influences temperature inversions, trapping pollutants during cooler months.

Sānderao experiences a distinct seasonal air quality pattern. The post-monsoon months (October-November) often see a temporary improvement as rainfall washes away accumulated pollutants, but this is short-lived. Winter (December-February) brings the most challenging conditions. Cooler temperatures lead to temperature inversions, trapping pollutants near the ground, exacerbated by increased use of solid fuels for heating. Calm wind conditions further hinder dispersion. March and April witness rising temperatures and dust storms, significantly increasing particulate matter concentrations, particularly PM10. These are months to avoid strenuous outdoor activity. The pre-monsoon summer (May-June) is characterised by hot, dry winds that can transport dust from the surrounding arid regions, maintaining elevated pollution levels. The monsoon season (July-September) provides the most significant relief. Heavy rainfall effectively scrubs the atmosphere, drastically improving air quality. However, increased humidity can also promote the formation of secondary pollutants. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor exposure during winter and the pre-monsoon summer. Monitoring local weather patterns and avoiding peak pollution hours are crucial for protecting health. The monsoon offers the most favourable conditions for outdoor activities.