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Minbu, situated in the Magway Region of Myanmar (coordinates 20.1800° N, 94.8700° E), occupies a geographically significant position within the Irrawaddy Basin. The city’s terrain is predominantly flat, characteristic of the alluvial plains formed by the Irrawaddy River and its tributaries. This low-lying landscape, averaging around 30 meters above sea level, contributes to a relatively stable atmospheric boundary layer, which can sometimes exacerbate pollution accumulation. Minbu is surrounded by a mosaic of agricultural land, primarily dedicated to rice cultivation, interspersed with patches of dry deciduous forest. The proximity to extensive agricultural zones means that seasonal burning practices, often employed for land clearing and crop residue disposal, can significantly impact local air quality. The urban–rural gradient around Minbu is gradual, with small villages and agricultural fields seamlessly blending into the city’s periphery. While not directly adjacent to a major river, the region’s groundwater table is high, influencing humidity levels and potentially affecting the dispersion of pollutants. The absence of significant topographic features like hills or mountains limits natural ventilation, further contributing to the potential for stagnant air conditions. The regional climate is tropical, with distinct wet and dry seasons, a factor that profoundly influences both the sources and the dispersion of airborne pollutants. Industrial activity in the immediate vicinity of Minbu is limited, but the city serves as a regional trading hub, with vehicular traffic representing a key contributor to local emissions. The flat, fertile landscape and reliance on agriculture define Minbu’s character, creating a unique interplay between human activity and air quality.

Minbu’s air quality experiences a pronounced seasonal cycle dictated by the region’s tropical climate. The dry season, typically spanning from November to April, presents the most challenging period. Reduced rainfall and lower humidity lead to a decrease in atmospheric moisture, hindering the natural cleansing effect of precipitation and promoting the accumulation of particulate matter. Temperature inversions, common during the cooler months (December-February), trap pollutants near the ground, intensifying localized air quality concerns. Agricultural burning, a widespread practice during this period to prepare fields for the monsoon planting season, releases substantial quantities of smoke and particulate matter, significantly degrading air quality. The monsoon season, from May to October, brings relief through frequent rainfall, which effectively washes pollutants from the atmosphere. However, periods of heavy fog, particularly in the early monsoon months, can temporarily reduce visibility and trap pollutants close to the ground. Wind patterns during the monsoon are generally more variable than during the dry season, aiding in the dispersion of pollutants, although localized areas may still experience elevated concentrations. The transitional months of April and October see fluctuating conditions, with a gradual shift in wind patterns and rainfall, leading to unpredictable air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activities during peak pollution episodes. Maintaining indoor air quality through ventilation and air purification can also be beneficial. Awareness campaigns promoting responsible agricultural practices and reducing vehicular emissions are crucial for mitigating air quality challenges in Minbu.