Perunād, nestled in the southern Indian state of Kerala, occupies a unique geographic position within the Western Ghats mountain range. Located at approximately 8.9563° N latitude and 76.6400° E longitude, the city’s terrain is characterized by undulating hills and valleys, a typical feature of the region's monsoonal landscape. Perunād sits at a modest elevation, contributing to a relatively mild climate, but also influencing local air circulation patterns. The surrounding landscape is dominated by dense tropical forests, interspersed with rubber and spice plantations – key components of Kerala’s agricultural economy. This proximity to agricultural zones introduces potential sources of biogenic volatile organic compounds (BVOCs), which can react with other pollutants to form secondary aerosols. The city’s urban fabric is a blend of traditional Kerala architecture and modern development, exhibiting a gradual urban–rural gradient as one moves outwards. The Ashtamudi Lake, a significant backwater lake, lies within relatively close proximity, influencing local humidity and potentially trapping pollutants under certain meteorological conditions. While Perunād isn't directly adjacent to major industrial belts, its regional connectivity and access to transportation networks mean it can be affected by pollution drift from larger industrial areas further north along the coast. The prevailing winds, generally southwesterly during the monsoon and northwesterly during the dry season, play a crucial role in dispersing or concentrating pollutants within the valley.

Perunād’s air quality experiences a distinct seasonal cycle dictated by Kerala’s monsoon climate. The southwest monsoon, typically spanning June to September, brings abundant rainfall and strong winds, generally leading to improved air quality as pollutants are washed out and dispersed. However, periods of prolonged rainfall can sometimes lead to stagnant conditions and increased humidity, potentially exacerbating respiratory issues for sensitive individuals. The pre-monsoon season (March-May) often sees a gradual increase in temperatures and decreasing wind speeds, creating conditions conducive to pollutant accumulation. This period can be characterized by increased dust from construction activities and agricultural burning, although the latter is generally regulated. The northeast monsoon (October-November) brings lighter rainfall and can occasionally result in localized fog, particularly in the mornings, which traps pollutants near the ground. The dry season (December-February) is generally the most pleasant in terms of air quality, with moderate temperatures and relatively consistent wind patterns. However, localized burning of agricultural waste, though restricted, can still contribute to short-term pollution spikes. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the pre-monsoon and transitional periods, limiting outdoor exertion during peak hours and monitoring for any respiratory discomfort. Maintaining indoor air quality through ventilation and air purification can also be beneficial during these times.