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Sundararaopeta, nestled within the Krishna River delta in Andhra Pradesh, India, occupies a geographically complex position significantly influencing its air quality. Located at approximately 16.52°N, 80.63°E, the city’s terrain is predominantly flat, characteristic of the fertile delta region, with an elevation of just 15 meters above sea level. This low elevation contributes to atmospheric stability, hindering vertical mixing and potentially trapping pollutants. The Krishna River, flowing nearby, offers some degree of moisture and can influence local wind patterns, though its impact on air quality is complex, sometimes exacerbating humidity-related issues. Sundararaopeta sits within a transitional zone between the densely populated urban sprawl of Vijayawada and the surrounding agricultural lands. This proximity to Vijayawada means the city is subject to urban pollution drift, while the agricultural belt introduces seasonal emissions from crop burning and fertilizer use. The urban–rural gradient is relatively sharp, with agricultural fields and smaller villages bordering the city, creating a patchwork landscape. The surrounding landscape is largely dominated by rice paddies and other cultivated crops, interspersed with occasional groves of mango and other fruit trees. The delta’s flat topography and humid subtropical climate, combined with the influence of nearby industrial activity and agricultural practices, create a unique set of conditions that shape Sundararaopeta’s air quality profile. The lack of significant topographical features limits natural dispersion of pollutants, making the city vulnerable to localized air quality degradation.

Sundararaopeta’s air quality follows a distinct seasonal pattern dictated by the region’s tropical climate and monsoon cycles. The dry season, typically spanning from March to May, presents the most challenging period. High temperatures and low humidity create atmospheric stability, often leading to temperature inversions where a layer of warm air traps cooler air and pollutants near the ground. This stagnation significantly reduces air dispersion, resulting in elevated particulate matter and gaseous pollutants. Agricultural burning, a common practice to clear fields for the next planting season, further exacerbates the situation during these months. The monsoon season, from June to September, brings relief with increased rainfall and stronger winds, effectively flushing out pollutants and improving air quality. However, heavy rainfall can also lead to increased humidity and the formation of ground-level ozone under certain conditions. The post-monsoon period (October-November) sees a gradual return to drier conditions, with a resurgence of agricultural burning contributing to a gradual decline in air quality. Finally, the cooler months (December-February) generally offer the best air quality, with lower temperatures and more frequent wind patterns aiding in pollutant dispersal. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activities during peak pollution hours. Maintaining indoor air quality through ventilation and air purifiers is also advisable.