Ludhiana, situated in the fertile Malwa region of Punjab, India, occupies a strategic position in the Indo-Gangetic Plain at an elevation of approximately 262 meters above sea level. The city lies on the banks of the Sutlej River's old course, though the river now flows about 13 kilometers to the south, creating a flat alluvial landscape that extends across northwestern India. This geographic setting places Ludhiana within one of South Asia's most intensive agricultural zones, surrounded by vast paddy and wheat fields that directly influence its air quality through seasonal stubble burning. The urban character is defined by its role as Punjab's industrial and commercial hub, with dense manufacturing clusters specializing in hosiery, bicycle components, and auto parts that generate significant particulate emissions. The city's location in the Sutlej-Ghaggar plain creates an urban-rural gradient where industrial emissions from the city core mix with agricultural pollution from surrounding farmlands, exacerbated by the region's flat terrain that inhibits natural ventilation. Proximity to the Himalayan foothills to the north contributes to temperature inversions during winter months, trapping pollutants close to the ground. The absence of significant water bodies within the immediate urban area reduces natural cleansing effects, while the city's position in the broader Delhi-Lahore industrial corridor intensifies transboundary pollution influences.

Ludhiana's air quality follows a distinct seasonal pattern shaped by agricultural cycles, industrial activity, and meteorological conditions. During spring (March-May), rising temperatures and occasional dust storms from the Thar Desert combine with ongoing industrial emissions, creating moderate pollution levels that worsen during heatwaves. The summer monsoon (June-September) brings the cleanest air as southwest winds and heavy rainfall effectively scrub pollutants from the atmosphere, making this the optimal period for outdoor activities. Autumn (October-November) marks the dramatic deterioration of air quality as post-monsoon agricultural stubble burning coincides with dropping temperatures and reduced wind speeds, creating hazardous pollution episodes that peak in late October and November. Winter (December-February) presents the most severe conditions as dense fog combines with temperature inversions to trap industrial emissions, vehicle exhaust, and residual agricultural smoke, creating prolonged smog events that particularly affect children, elderly residents, and those with respiratory conditions. Sensitive groups should avoid morning outdoor activities during peak pollution months and consider air purifiers indoors. The transitional periods between monsoon withdrawal and winter onset require particular caution as multiple pollution sources converge under unfavorable meteorological conditions.