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Narendrapatnam, nestled in the Prakasam district of Andhra Pradesh, India, occupies a geographically significant position within the Krishna-Godavari delta region. Located at approximately 17.0964° N latitude and 81.8812° E longitude, the city’s terrain is predominantly flat, characteristic of the fertile alluvial plains formed by the Krishna and Godavari rivers. Its elevation is relatively low, contributing to a tendency for pollutants to accumulate, particularly during periods of atmospheric stability. Narendrapatnam sits on the edge of a gradual urban-rural gradient, transitioning from a small urban centre to agricultural lands primarily used for rice and pulses cultivation. This proximity to agricultural zones introduces potential sources of air pollution, including biomass burning during harvest seasons and the use of fertilizers. The city is not directly adjacent to a major river, but benefits from the region’s extensive canal network, vital for irrigation. The surrounding landscape is largely dominated by flat, cultivated fields interspersed with occasional groves of mango and coconut trees. Further afield, the landscape rises gently towards the Eastern Ghats, though Narendrapatnam itself remains within the deltaic plain. The regional industrial landscape is relatively sparse, with smaller-scale industries concentrated in nearby towns, but their cumulative impact can still influence Narendrapatnam’s air quality. The flat topography and prevailing wind patterns, often light and variable, can exacerbate the build-up of local pollutants, especially during calmer periods.

Narendrapatnam’s air quality exhibits a distinct seasonal pattern dictated by the region’s tropical climate. The period from March to May, the pre-monsoon season, typically witnesses the poorest air quality. High temperatures and low relative humidity create atmospheric conditions conducive to the formation of stagnant air masses, often leading to temperature inversions that trap pollutants near the ground. Agricultural burning, a common practice during this period to clear fields for the Kharif season, significantly contributes to particulate matter pollution. The monsoon season, from June to September, brings a welcome respite. Strong winds and frequent rainfall effectively flush out pollutants, leading to a marked improvement in air quality. October and November represent a transitional period, with gradually decreasing rainfall and increasing temperatures, potentially leading to a slow deterioration in air quality. The winter months, December to February, are generally characterized by cooler temperatures and calmer winds, which can occasionally result in localized fog. While temperatures are lower, the lack of strong wind dispersion can still lead to pollutant accumulation, particularly if agricultural burning persists. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the pre-monsoon months and be mindful of potential fog events in winter. Outdoor activities are generally best enjoyed during the monsoon season when air quality is typically at its best. Minimizing exposure to smoke from cooking fires and agricultural burning is crucial for maintaining respiratory health throughout the year.