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Mādala, nestled in the undulating landscape of Andhra Pradesh, India, occupies a geographically significant position within the Krishna River basin. Located at approximately 16.37°N, 80.11°E, the city’s terrain is characterized by gently sloping plains, typical of the Deccan Plateau. Its elevation, relatively modest, contributes to a localized trapping of pollutants under certain meteorological conditions. The surrounding landscape is a mosaic of agricultural fields – predominantly rice and pulses – interspersed with pockets of scrubland and occasional granite outcrops, reflecting the region’s geological history. The proximity to the Krishna River, though providing a vital water source, can also influence local air quality through humidity and potential for riverine transport of pollutants. Mādala’s urban character is that of a small, developing town, with a gradual urban–rural gradient extending outwards. While not directly adjacent to major industrial belts, it benefits from, and is potentially impacted by, regional agricultural practices, including the burning of crop residue post-harvest, a common occurrence in surrounding districts. The city’s location within a broader agricultural zone means that dust from tilling and transportation, alongside emissions from smaller-scale industries and residential sources, collectively shape its air quality profile. The regional climate, dominated by monsoonal patterns, further influences the dispersion and accumulation of airborne particles, creating a complex interplay between geography and pollution.

Mādala’s air quality experiences a distinct seasonal cycle dictated by the region’s tropical climate and monsoonal influences. The pre-monsoon season (March-May) typically witnesses the poorest air quality. Rising temperatures and decreasing humidity create stable atmospheric conditions, often leading to temperature inversions where cooler air becomes trapped beneath a layer of warmer air, preventing vertical mixing and concentrating pollutants near the ground. Agricultural burning, prevalent during this period as farmers clear fields, significantly exacerbates the problem. The monsoon season (June-September) brings relief, with increased rainfall and stronger winds dispersing pollutants. Humidity rises, and the frequent downpours effectively ‘wash’ particulate matter from the atmosphere. October and November mark a transitional period, with gradually decreasing rainfall and a return to more stable atmospheric conditions, potentially leading to a slight deterioration in air quality. Winter months (December-February) are generally characterized by cooler temperatures and occasional fog, which can trap pollutants and reduce visibility. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the pre-monsoon season and periods of fog, limiting outdoor exertion and wearing appropriate masks. Maintaining indoor air quality through ventilation and air purifiers is also advisable. The agricultural cycle and associated burning practices are key drivers of seasonal air quality fluctuations, demanding targeted mitigation strategies.