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Jaffna, situated in North Central Sri Lanka (9.6647° N, 80.0167° E), occupies a unique and historically significant geographic position. The city is the capital of the Northern Province and lies on a peninsula jutting into the Palk Strait, separating India from Sri Lanka. This peninsular location profoundly influences Jaffna’s climate and, consequently, its air quality. The terrain is predominantly flat, characterized by limestone bedrock and sandy soils, a legacy of ancient coral reefs. This flatness limits vertical mixing of air, potentially trapping pollutants under certain meteorological conditions. Surrounding Jaffna are extensive agricultural lands, primarily dedicated to palmyra cultivation, rice paddies, and increasingly, horticulture. While these agricultural activities contribute to the rural landscape, fertilizer use and occasional burning of crop residue can introduce localized pollutants. To the east and west, the Palk Strait and the Gulf of Mannar provide a degree of maritime influence, moderating temperatures and occasionally dispersing pollutants via sea breezes. The urban–rural gradient is relatively sharp, with dense urban areas transitioning quickly to agricultural zones and scrubland. There are no major industrial belts immediately adjacent to Jaffna, though Colombo, with its industrial activity, lies approximately 300km south, and its influence can occasionally be felt through long-range transport of pollutants. The peninsula's exposure to prevailing winds from the Bay of Bengal also plays a crucial role in air quality dynamics, bringing in both cleaner air and, at times, pollutants from distant sources.

Jaffna’s tropical climate dictates a distinct wet and dry season pattern, significantly impacting air quality. The dry season, typically spanning from March to September, is characterized by consistently high temperatures and lower humidity. This period often sees a slight increase in particulate matter due to increased construction activity and dust stirred up by prevailing winds. The lack of rainfall during these months means there's less natural cleansing of the atmosphere. Conversely, the wet season, from October to February, brings frequent rainfall and higher humidity. The monsoons, particularly the Northeast Monsoon (October-January), effectively flush pollutants from the air, leading to improved air quality. However, periods of prolonged rainfall can sometimes lead to damp conditions that exacerbate respiratory issues for sensitive individuals. Fog, though infrequent, can occur during the cooler months (December-January), trapping pollutants near the ground and creating localized air quality concerns. Temperature inversions, where a layer of warm air sits above cooler air, are less common but can occur, preventing vertical mixing and leading to pollutant accumulation. The agricultural cycle also influences air quality; burning of agricultural waste, though regulated, can occasionally occur, particularly during the transition periods between seasons. Sensitive groups, such as children, the elderly, and those with pre-existing respiratory conditions, should exercise caution during the drier months and be mindful of potential localized pollution events related to agricultural practices. Outdoor activities are generally more favorable during the wet season, especially after rainfall.