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Tokār, a coastal city in Sudan’s Red Sea State, occupies a unique geographical position along the western shore of the Red Sea at approximately 18.4333°N, 37.7333°E. The city’s terrain is largely flat, transitioning from the sandy coastline to arid plains inland. Its elevation is minimal, contributing to limited natural dispersion of pollutants. Tokār’s urban character is defined by its port facilities, serving as a crucial hub for trade and fishing, and a growing residential area supporting these industries. The surrounding landscape is dominated by the Eastern Desert, a harsh environment with sparse vegetation. The Red Sea exerts a significant influence on the local climate and, consequently, air quality. Sea breezes can offer temporary relief from dust and pollutants, but also contribute to humidity and potential salt spray. While Tokār isn’t situated near major industrial belts, the port itself generates emissions from shipping, cargo handling, and associated transport. Agricultural activity is limited due to the arid conditions, reducing agricultural burning as a pollution source. The urban-rural gradient is relatively sharp, with a rapid transition from the city’s concentrated activity to the sparsely populated desert. This proximity to a vast, arid region means Tokār is highly susceptible to dust storms originating from the Sahara and Ethiopian Highlands, significantly impacting particulate matter levels.

Tokār experiences a harsh desert climate with a distinct wet-dry season pattern rather than traditional four seasons. Air quality is generally poorest during the dry season, spanning roughly November to April. This period is characterized by strong, dry winds that mobilize vast quantities of dust from the surrounding desert, leading to elevated particulate matter concentrations. Temperature inversions, common during cooler nights, trap pollutants near the ground, exacerbating the issue. The months of January and February are particularly challenging. The brief wet season, from May to October, brings some improvement in air quality due to rainfall scavenging pollutants and suppressing dust. However, increased humidity can also promote the formation of secondary pollutants. September and October often see a resurgence of dust as the winds shift. The *khareef* winds, originating from the Indian Ocean, can occasionally bring moisture and temporary relief, but also introduce pollutants from distant sources. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during peak dust periods (November-February) and monitor their health closely. Wearing masks and using air purifiers indoors are recommended during these times.