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Nestled in the upper Brahmaputra Valley of northeastern India, Dibrugarh occupies a strategic position as the gateway to Assam's tea-growing heartland. The city sits at a modest elevation of approximately 108 meters above sea level on the southern bank of the Brahmaputra River, whose expansive floodplains and shifting channels define the surrounding terrain. This riverine geography creates a complex urban-rural gradient where the compact urban core blends into sprawling tea estates, paddy fields, and scattered villages. The proximity to the Brahmaputra significantly influences air quality through seasonal humidity variations and occasional fog formation that traps pollutants. Dibrugarh lies within Assam's industrial belt, with the historic Digboi oil refinery located just 40 kilometers to the southeast, while numerous tea processing factories and brick kilns dot the peri-urban landscape. The city is flanked by the Eastern Himalayas to the north and the Patkai Hills to the east, creating a topographic bowl effect that limits pollutant dispersion during calm weather conditions. This geographical confinement, combined with the convergence of agricultural, industrial, and domestic emission sources across the valley, creates persistent air quality challenges that are magnified by the region's humid subtropical climate.

Dibrugarh's air quality follows a distinct seasonal rhythm shaped by the monsoon cycle and winter meteorological conditions. During the winter months from November through February, pollution reaches its peak as cold, dense air settles in the Brahmaputra Valley, creating frequent temperature inversions that trap vehicle exhaust, industrial emissions, and smoke from domestic biomass burning and agricultural waste. These months experience persistent fog and low wind speeds, preventing pollutant dispersion and making outdoor activities particularly hazardous for sensitive groups like children, the elderly, and those with respiratory conditions. The pre-monsoon period from March to May brings gradually improving conditions as rising temperatures create more vertical mixing, though occasional dust from dry riverbeds and agricultural fields can cause temporary spikes. The monsoon season from June to September offers the cleanest air as heavy rainfall scrubs pollutants from the atmosphere and strong southerly winds disperse emissions. Post-monsoon October sees a transitional period with moderate air quality before winter deterioration begins. For health protection, sensitive individuals should limit outdoor exertion during winter mornings when pollution concentrations are highest and consider wearing N95 masks during peak pollution months.