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Munnar, nestled in the Western Ghats of Kerala, India, is a hill station renowned for its sprawling tea plantations. Situated at approximately 10.0892°N, 77.0597°E and an elevation averaging 1,600 meters (5,249 feet), the town’s geography profoundly influences its air quality. The surrounding landscape is dominated by steep, undulating hills covered in dense vegetation, primarily tea, but also cardamom and other spice crops. Munnar isn’t directly adjacent to large bodies of water, though numerous streams and rivers originate from the surrounding mountains, feeding into the Periyar River. While Munnar itself isn’t heavily industrialised, the broader Idukki district experiences some quarrying and small-scale processing industries. The urban-rural gradient is sharp; the town centre is relatively compact, quickly transitioning into agricultural land and then dense forest. This elevation and terrain create complex airflow patterns, potentially trapping pollutants during temperature inversions. The constant moisture from the cloud forests also contributes to aerosol formation. Agricultural practices, including the use of fertilizers and occasional burning of plantation waste, represent a significant localised source of particulate matter. The town’s position within a valley can exacerbate pollutant concentration, particularly during calm weather conditions. The dense vegetation, while beneficial overall, can also release biogenic volatile organic compounds (BVOCs) which contribute to secondary pollutant formation.

Munnar experiences a distinct wet and dry season, rather than traditional four seasons. The southwest monsoon, from June to September, brings heavy rainfall, effectively scouring the atmosphere and resulting in generally improved air quality. The constant precipitation washes away particulate matter and suppresses dust. However, increased humidity can also promote mould growth, potentially impacting respiratory health. October to February constitutes the drier season, with cooler temperatures and clearer skies. This period often sees a slight increase in particulate matter due to reduced rainfall and increased agricultural activity, such as tea leaf harvesting and processing. January and February are typically the clearest months for outdoor activities. March to May is a transitional period, becoming warmer and drier, with a gradual build-up of dust and potential for localised burning of agricultural residue. This period can see a deterioration in air quality. Fog is common throughout the year, particularly during the cooler months, which can trap pollutants near the ground. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during drier periods and be mindful of potential irritants from agricultural practices. Monitoring wind patterns is crucial, as valley winds can concentrate pollutants.