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Mānāmadurai, nestled in the Thanjavur district of Tamil Nadu, India, occupies a geographically significant position within the Cauvery Delta, a fertile and densely populated region. Located at approximately 9.6956° N, 78.4564° E, the city’s terrain is predominantly flat, characteristic of the deltaic landscape formed by the Cauvery River. The elevation is minimal, rarely exceeding 15 meters above sea level, contributing to a low dispersion potential for pollutants. The surrounding landscape is overwhelmingly agricultural, dominated by rice paddies and other crops, interspersed with small villages and rural settlements. This creates a distinct urban–rural gradient, with Mānāmadurai acting as a local market and service center for the surrounding agricultural communities. While not directly adjacent to a major river, the city’s proximity to the Cauvery River and its network of canals influences local humidity and temperature patterns. The region’s climate is tropical, with hot and humid conditions prevailing throughout the year. The flat topography and limited elevation hinder the natural vertical mixing of air, potentially trapping pollutants close to the ground. While large-scale industrial zones are not immediately adjacent, the region supports smaller-scale agricultural processing units and brick kilns, which can contribute to localized air pollution. The delta's dense population and agricultural practices, including fertilizer use and occasional crop burning, further influence the regional air quality profile, impacting Mānāmadurai’s ambient air quality.

Mānāmadurai’s air quality experiences a distinct seasonal cycle dictated by the region’s tropical monsoon climate. The southwest monsoon (June to September) brings relief from the oppressive heat, with increased rainfall and stronger winds that generally improve air quality by dispersing pollutants. However, periods of heavy rainfall can also lead to localized flooding and increased humidity, potentially exacerbating respiratory issues for sensitive individuals. The pre-monsoon season (March to May) is typically the most challenging period, characterized by high temperatures, stagnant air, and minimal rainfall. Temperature inversions, common during this time, trap pollutants near the ground, leading to a build-up of particulate matter and other emissions. Agricultural activities, including fertilizer application and occasional controlled burning of crop residue, contribute to this pollution. The northeast monsoon (October to December) brings moderate rainfall and wind, offering a temporary respite. The winter months (December to February) are generally milder, but fog can frequently form, particularly in the early mornings, reducing visibility and trapping pollutants. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the pre-monsoon season and periods of fog, limiting outdoor exertion and wearing appropriate masks. The humid climate throughout the year can also aggravate asthma and other respiratory ailments, necessitating careful management of indoor air quality and proactive health measures.