Dohazāri Air Quality Index (AQI)

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Dohazāri sits within the dynamic landscape of the Chattogram division, where the lush alluvial plains of the Bengal Delta begin to encounter the undulating foothills of the east. This strategic position places the town in a transitional zone, characterized by a high water table and a network of seasonal streams that drain toward the Bay of Bengal. The terrain is predominantly flat, yet it is punctuated by modest elevations that influence local wind patterns. As a semi-urban hub, Dohazāri exhibits a distinct urban-rural gradient; the denser residential core is encircled by sprawling agricultural zones dominated by paddy fields and vegetable gardens. This geography plays a critical role in air quality dynamics. The surrounding vegetation acts as a partial carbon sink, yet the low-lying topography often traps pollutants during periods of atmospheric stability. Proximity to regional transport arteries introduces significant vehicular emissions, while the surrounding agricultural belts contribute particulate matter through seasonal crop residue burning. Furthermore, the region's high humidity, driven by its maritime proximity, facilitates the formation of secondary aerosols, where gaseous pollutants transform into fine particulate matter. The interplay between the moist coastal air and the inland heat creates a microclimate where stagnant air masses can linger, particularly during the pre-monsoon heat. Consequently, the geographic positioning of Dohazāri makes it susceptible to both local anthropogenic emissions and the broader regional haze that frequently blankets the Chattogram division during the drier months of the year and winter.

The air quality in Dohazāri is governed by the rhythmic pulse of the tropical monsoon climate, creating a stark dichotomy between the wet and dry seasons. During the winter months, from November to February, the town experiences its most challenging atmospheric conditions. Cool, dense air creates temperature inversions that trap pollutants—primarily from brick kilns and domestic biomass burning—near the ground, leading to a persistent, heavy haze. This period is the most hazardous for sensitive groups, including children and the elderly, who should minimize prolonged outdoor exertion during early morning hours when fog exacerbates particulate concentrations. As spring arrives in March and April, rising temperatures and pre-monsoon winds begin to disperse these pollutants, although occasional dust storms may spike particulate levels. The arrival of the southwest monsoon in June brings a dramatic shift; torrential rains provide a natural scrubbing mechanism, washing aerosols and particulates from the atmosphere. This period represents the cleanest air of the year, making it the ideal window for outdoor activities. However, the high humidity can exacerbate respiratory discomfort for some. In the autumn transition, as rains subside in October, air quality begins to dip again as agricultural clearing commences. Health guidance for residents emphasizes the use of protective masks during the winter peak and maintaining hydration during the humid summer. By understanding this seasonal cycle, the community can better navigate the environmental risks associated with the region's unique meteorological patterns and anthropogenic pressures and industrial growth.