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Dhahran, situated in the Eastern Province (Ash Sharqīyah) of Saudi Arabia, occupies a unique geographic position on the Arabian Gulf coastline. Its coordinates (26.2667° N, 50.1500° E) place it within a largely flat, arid landscape dominated by the Arabian Desert. The city’s terrain is characterized by gently undulating sand dunes and sabkha (salt flats), typical of the region's coastal plains. Dhahran’s proximity to the Gulf significantly influences its microclimate, moderating temperatures slightly compared to inland areas, but also introducing humidity and potential for coastal fog. The surrounding landscape is primarily desert, transitioning to more rugged terrain further inland, part of the larger Rub' al Khali desert. A defining feature of the region is the presence of extensive oil fields, forming a significant industrial belt stretching along the coast. This concentration of petroleum infrastructure, including refineries and processing plants, is a primary driver of localized air quality concerns. The urban–rural gradient around Dhahran is relatively sharp; the city is surrounded by sparsely populated desert communities and agricultural areas reliant on groundwater irrigation, primarily for date palm cultivation. The low elevation (generally below 20 meters) contributes to temperature inversions, particularly during cooler months, trapping pollutants near the ground. The city’s location within a major hydrocarbon-producing region means that fugitive emissions and industrial processes are inherent factors shaping the local environment, impacting air quality patterns and requiring ongoing monitoring and mitigation strategies.

Dhahran’s air quality experiences a distinct seasonal pattern dictated by its arid climate and meteorological conditions. The hot, humid summer months (June-August) are generally characterized by stagnant air and elevated levels of pollutants due to high temperatures and reduced wind speeds. Intense solar radiation contributes to photochemical smog formation, exacerbated by emissions from industrial activities and vehicle traffic. The lack of significant rainfall during this period allows pollutants to accumulate. Conversely, the cooler, drier months (November-March) often bring improved air quality, although temperature inversions can occasionally trap pollutants, leading to localized episodes of poor air quality. These inversions, common during the winter, occur when a layer of warm air sits above cooler air near the ground, preventing vertical mixing and trapping pollutants. Spring (March-May) sees a gradual increase in wind speeds, which helps to disperse pollutants, leading to a period of relatively cleaner air. Dust storms, originating from the surrounding deserts, are a recurring phenomenon throughout the year, particularly during the spring and summer, significantly degrading air quality and impacting respiratory health. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should limit outdoor activity during periods of high dust or stagnant air. Staying indoors with air filtration systems and avoiding strenuous exercise are recommended during these times. Hydration is also crucial to mitigate the effects of dust exposure.