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Chāgallu, a municipality in the Krishna district of Andhra Pradesh, India, occupies a relatively flat terrain typical of the coastal plains. Situated at approximately 16.9833°N latitude and 81.6667°E longitude, the city benefits from proximity to the Krishna River, a vital waterway influencing local climate and agricultural practices. The surrounding landscape is predominantly agricultural, characterized by rice paddies and other cultivated lands, interspersed with pockets of rural settlements. This agrarian dominance contributes significantly to seasonal biomass burning, a key factor in local air quality. Chāgallu’s elevation is low, increasing its susceptibility to humidity and temperature fluctuations. The urban-rural gradient is fairly sharp, with the city centre exhibiting denser construction and traffic compared to the surrounding villages. While not a major industrial hub, the presence of small-scale industries and brick kilns in the region adds to particulate matter emissions. The coastal location means the city is also vulnerable to sea breezes which can transport pollutants inland, and conversely, disperse them. Understanding this interplay between agricultural practices, riverine influence, and limited industrial activity is crucial for assessing Chāgallu’s air quality challenges. The relatively low elevation and flat topography can also exacerbate pollution build-up, hindering natural dispersion.

Chāgallu experiences a tropical climate, with distinct wet and dry seasons heavily influencing air quality. The post-monsoon period (October-November) often sees a temporary improvement as rainfall washes away accumulated pollutants. However, this is short-lived. The dry season (December-May) is typically the most challenging period, with increased dust from agricultural activities and construction, coupled with temperature inversions trapping pollutants near the ground. February to April are particularly problematic, as drier conditions encourage biomass burning for land preparation. The southwest monsoon (June-September) brings relief, with heavy rainfall cleansing the air, but also increasing humidity which can foster mold growth indoors. Wind patterns shift during the monsoon, potentially altering pollutant dispersion. October can see residual moisture and calm winds leading to localised pollution pockets. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor exertion during the dry season, particularly February-April. During the monsoon, focus shifts to preventing waterborne diseases and maintaining indoor air quality. Monitoring local weather forecasts is vital for proactive health management. Avoiding peak traffic hours can also reduce exposure to vehicular emissions.