Kasama Air Quality Index (AQI)

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Kasama, situated in Zambia’s Northern Province at coordinates -10.2117, 31.1783, occupies a geographically significant position within the country’s undulating landscape. The city sits at an elevation of approximately 1350 meters (4430 feet) above sea level, placing it within the higher-altitude plateau region of Zambia. This elevation contributes to cooler temperatures compared to lower-lying areas, but also influences atmospheric stability, a key factor in air quality. Kasama is surrounded by a mosaic of agricultural land, primarily dedicated to maize cultivation and livestock rearing, forming a distinct urban-rural gradient. The surrounding terrain is characterized by gently rolling hills and valleys, interspersed with miombo woodland – a dominant vegetation type in the region. While not directly adjacent to major rivers, the area receives rainfall that feeds smaller streams and contributes to localized humidity. The city’s regional position, relatively distant from major industrial belts, initially suggests lower pollution risks. However, agricultural practices, including burning of crop residue after harvest, and the increasing use of vehicles within the city contribute to localized air quality challenges. The prevailing winds, generally from the southeast during certain periods, can transport pollutants from surrounding agricultural areas into the city, impacting air quality. The urban character of Kasama is developing, with a mix of traditional housing and newer constructions, and a growing population placing increased demands on infrastructure and potentially impacting air quality through increased traffic and energy consumption.

Kasama’s air quality experiences a distinct seasonal pattern dictated by its tropical savanna climate. The wet season, typically spanning November to April, brings frequent rainfall and higher humidity, generally leading to improved air quality as precipitation washes away particulate matter and dilutes pollutants. However, the onset of the rainy season can be preceded by periods of stagnant air and increased dust from freshly ploughed fields. The dry season, from May to October, presents a more complex picture. During the cooler months (June-August), temperature inversions can occur, trapping pollutants near the ground, particularly in the mornings. These inversions, where a layer of warm air sits above cooler air, inhibit vertical mixing and worsen air quality. Agricultural burning, a common practice to clear land for planting, is most prevalent during the dry season, significantly contributing to particulate pollution. September and October often see a build-up of pollutants before the rains arrive, creating periods of poorer air quality. Wind patterns during the dry season are less consistent than during the wet season, further exacerbating the issue. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the cooler, drier months, particularly during periods of agricultural burning. Outdoor activities are generally more favourable during the wet season, although caution should be taken during periods of intense dust from agricultural activities. The transition months (April/May) can be unpredictable, with fluctuating humidity and wind patterns influencing air quality.