Loading air quality context...

Alahina, situated in the Koulikoro Region of Mali at coordinates 15.2267°N, -8.7447°W, is a small urban centre deeply embedded within the Sahelian landscape. The city’s terrain is generally flat, characteristic of the inner Niger Delta, with a subtle slope towards the Niger River, which lies to the east. This proximity to the river is crucial, influencing local microclimates and supporting agricultural activity, primarily rain-fed farming and pastoralism. The surrounding landscape is dominated by savanna woodland, interspersed with agricultural fields, particularly during the wet season. Alahina’s relatively small population of 11,673 suggests a strong urban-rural gradient, with significant reliance on surrounding rural areas for food and resources. Air quality is intrinsically linked to this landscape; dust from agricultural practices and the dry Sahelian environment are major contributors to particulate matter. The lack of substantial industrial development within Alahina itself means that local pollution sources are primarily related to domestic fuel use (wood and charcoal) and vehicle emissions from transport along regional routes. The city’s location within a broad river valley can also trap pollutants during periods of atmospheric stability, exacerbating air quality issues. Understanding these geographical factors is vital for assessing and mitigating pollution risks in Alahina.

Alahina experiences a distinct wet and dry season, heavily influencing its air quality. The dry season, roughly from November to May, is characterised by consistently high temperatures and low humidity. This period sees a significant increase in airborne dust and particulate matter, originating from agricultural activities, land degradation, and Harmattan winds blowing from the Sahara Desert. January to March are typically the months with the poorest air quality, posing risks to those with respiratory conditions. The transition to the wet season, around June, brings a temporary improvement as rainfall suppresses dust. However, increased humidity can also promote the formation of mould and fungal spores, impacting indoor air quality. The peak of the wet season, July to September, generally offers the best air quality, with rainfall effectively cleansing the atmosphere. However, stagnant air and localised flooding can create pockets of poor air quality. October sees a gradual return to drier conditions and a corresponding decline in air quality. Sensitive groups – children, the elderly, and those with pre-existing respiratory illnesses – should limit outdoor exposure during the dry season and take precautions to protect themselves from dust inhalation. Monitoring wind patterns and avoiding strenuous activity during peak dust periods is advisable.