Adré Air Quality Index (AQI)

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Adré, situated in the Ouaddaï Province of Chad, occupies a geographically significant position in the Sahelian zone. Located at coordinates 13.4667° N, 22.2000° E, the city sits on a relatively flat plain, approximately 580 meters above sea level. This terrain, characteristic of the southern edge of the Sahara Desert, is predominantly arid and semi-arid, transitioning into grasslands further south. Adré’s location is crucial as a border town with Sudan, making it a key transit point for trade and migration, and consequently, a hub of activity. The surrounding landscape is largely composed of scrubland and acacia trees, with limited surface water sources beyond seasonal wadis. While not directly adjacent to a major body of water, the city’s proximity to the seasonal rivers influences local microclimates. The urban-rural gradient is sharp; Adré itself is a concentrated settlement, quickly giving way to sparsely populated pastoral lands. Dust from the Sahara, frequently carried by Harmattan winds, significantly impacts air quality. Limited industrial activity within Adré itself is offset by cross-border transport and associated vehicle emissions, alongside dust kicked up by market activity and unpaved roads. The concentration of people and goods makes Adré a focal point for localised pollution, exacerbated by the region’s arid climate and wind patterns.

Adré experiences a distinct wet and dry season, heavily influencing its air quality. The dry season, spanning roughly November to May, is characterised by consistently high temperatures and the prevalence of Harmattan winds blowing from the Sahara. These winds carry substantial amounts of dust and particulate matter, leading to significantly degraded air quality. February and March are typically the worst months for respiratory health due to peak dust concentrations. The wet season, from June to October, brings relief from dust but introduces new challenges. While rainfall helps to suppress dust, increased humidity can promote the growth of mold and mildew, potentially triggering allergic reactions. The increased moisture also contributes to localised pollution from unpaved roads becoming muddy and increasing vehicle emissions. September and October, towards the end of the rainy season, often see a resurgence of dust as the ground dries. Temperature inversions, common during cooler nights, can trap pollutants near ground level, worsening conditions. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit outdoor activity during peak dust periods and be mindful of indoor air quality throughout the year. Monitoring wind direction and staying indoors during Harmattan surges is advisable.