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Ad Dammām, the capital of Saudi Arabia's Eastern Province, occupies a strategic coastal position on the Arabian Gulf, with its coordinates at 26.4333°N, 50.1000°E placing it at the heart of the world's largest oil-producing region. The city sits on a flat coastal plain with minimal elevation, rarely exceeding 10 meters above sea level, creating a landscape where urban sprawl merges seamlessly with industrial complexes. This low-lying terrain, combined with its proximity to the Gulf waters, significantly influences local air quality through humidity retention and limited natural ventilation. Ad Dammām forms part of the Dammam Metropolitan Area alongside Al Khobar and Dhahran, creating an urban continuum that stretches along the coastline with minimal green buffers. The city's location places it within Saudi Arabia's primary industrial belt, surrounded by oil refineries, petrochemical plants, and port facilities that contribute substantially to atmospheric pollutants. To the west lies the vast Arabian Desert, whose sand particles periodically sweep into the urban area, while the Gulf waters to the east moderate temperatures but also trap pollutants under certain meteorological conditions. This urban-rural gradient shows abrupt transitions from dense commercial districts to industrial zones with limited agricultural activity, primarily date palm cultivation in scattered oases. The city's geography as a coastal industrial hub means air quality is constantly influenced by both maritime conditions and industrial emissions, with the flat terrain preventing natural dispersion of pollutants during stagnant weather patterns.

Ad Dammām experiences distinct seasonal variations in air quality driven by its desert coastal climate, though official climate zone classification remains unspecified. During winter (December-February), cooler temperatures and occasional Shamal winds from the northwest can disperse pollutants, making this period relatively favorable for outdoor activities, though morning fog and temperature inversions sometimes trap pollutants near the surface. Spring (March-May) sees increasing temperatures and humidity, with sandstorms from the desert interior becoming more frequent, significantly degrading air quality with particulate matter; sensitive groups should limit outdoor exposure during dust events. Summer (June-August) brings extreme heat exceeding 40°C and high humidity, creating stagnant atmospheric conditions where pollutants accumulate, particularly ozone formation from industrial emissions reacting with sunlight; this season presents the highest health risks, especially for those with respiratory conditions who should avoid midday outdoor exertion. Autumn (September-November) offers gradual improvement as temperatures moderate and sea breezes increase ventilation, though early autumn can still experience residual summer pollution patterns. The peak pollution months vary annually but typically align with summer stagnation and spring dust storms, while winter months generally provide cleaner air windows. Meteorological factors like temperature inversions are common year-round due to the flat terrain, while the absence of monsoon systems means pollution patterns depend more on local wind patterns and industrial activity cycles rather than seasonal rainfall.