Tezpur Air Quality Index (AQI)

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Nestled in the Brahmaputra Valley of Assam in northeastern India, Tezpur occupies a strategic position along the northern banks of the mighty Brahmaputra River, approximately 175 kilometres northeast of Guwahati. This historic city, often called the 'Cultural Capital of Assam,' sits at an elevation of about 48 metres above sea level, with its urban character blending colonial-era architecture with modern development amid lush greenery. The surrounding landscape is dominated by the Himalayan foothills to the north and the expansive Brahmaputra floodplains to the south, creating a distinct urban–rural gradient where the city centre transitions rapidly into tea gardens, paddy fields, and forested areas. Tezpur's location in a valley basin significantly impacts air quality, as pollutants from local sources—including vehicle exhaust from National Highway 15, emissions from the nearby Tezpur Air Force Station, construction dust from ongoing infrastructure projects, and domestic biomass burning in peri-urban zones—tend to accumulate due to limited dispersion. Proximity to the Brahmaputra River contributes to high humidity, which can exacerbate particulate matter formation, while the absence of major industrial belts in the immediate vicinity means pollution is primarily driven by urban activities and seasonal agricultural practices. The terrain, characterised by gentle slopes and riverine ecosystems, combined with the city's position in a seismically active zone, further influences environmental dynamics, making air quality management a complex interplay of geographic and anthropogenic factors.

Tezpur's air quality follows a distinct seasonal pattern shaped by its humid subtropical climate and the dominant monsoon system. During the winter months from November to February, pollution peaks dramatically due to a combination of meteorological factors: low temperatures and calm winds create frequent temperature inversions that trap pollutants near the ground, while high humidity and morning fog enhance the formation of fine particulate matter from sources like vehicle exhaust, road dust, and domestic biomass burning for heating. Sensitive groups, such as children, the elderly, and those with respiratory conditions, should avoid prolonged outdoor activities during these months, especially in the early mornings when pollution concentrations are highest. The pre-monsoon season from March to May sees some improvement as rising temperatures and occasional thunderstorms help disperse pollutants, though construction dust and waste burning can still pose moderate risks. The monsoon from June to September brings the cleanest air, as heavy rainfall washes away particulate matter and strong winds from the southwest monsoon sweep pollutants eastward, making this period favourable for outdoor activities. Post-monsoon from October onwards marks a gradual deterioration as humidity rises and wind patterns shift, leading to the buildup of emissions ahead of the winter peak. Health guidance emphasises monitoring local air quality reports, using masks during peak pollution months, and planning outdoor exercises for midday when dispersion is better.