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Mouiat Ouennsa, nestled within the El Oued Province of Algeria, occupies a unique and challenging geographic position. Located at approximately 33.1969° latitude and 6.7053° longitude, the city sits on the fringes of the Sahara Desert, a defining influence on its climate and, consequently, its air quality. The surrounding landscape is dominated by the Grand Erg Oriental, a vast expanse of sand dunes and rocky plains, contributing to a generally arid environment. Elevation is relatively low, averaging around 300 meters above sea level, which can exacerbate the trapping of pollutants under certain meteorological conditions. El Oued itself is historically known as the 'City of a Thousand Dates,' reflecting the importance of oasis agriculture in the region. While Mouiat Ouennsa is a smaller settlement compared to El Oued city, it benefits from proximity to agricultural zones cultivating dates and other desert-adapted crops. This agricultural activity, while vital to the local economy, can contribute to particulate matter through dust and occasional burning practices. The urban–rural gradient is sharp; the city transitions quickly into the desert landscape, limiting the natural dispersal of pollutants. There are no significant bodies of water nearby to aid in air cleansing. The region lacks major industrial belts, but occasional transport of goods through the area can introduce emissions. The prevailing winds, often originating from the Sahara, frequently carry dust and sand, significantly impacting air quality and visibility, particularly during specific seasons. The city's compact urban form, typical of many Algerian settlements, can also contribute to localized pollution concentrations.

Mouiat Ouennsa’s air quality follows a distinct seasonal pattern dictated by its Saharan climate. The hot, dry summers (June-August) are characterized by intense solar radiation and minimal rainfall, leading to high temperatures and frequent dust storms. These storms, driven by strong winds, dramatically reduce visibility and elevate particulate matter concentrations. Temperature inversions, common during these months, trap pollutants close to the ground, further worsening air quality. Spring (March-May) offers a slight respite, with milder temperatures and occasional dust events, but the transition period can be unpredictable. Autumn (September-November) sees a gradual cooling and a decrease in dust storm frequency, providing the most favourable conditions for outdoor activities. However, agricultural burning practices, undertaken to clear fields after harvest, can temporarily elevate smoke levels. Winter (December-February) is generally the coolest period, but fog formation, particularly in the early mornings, can trap pollutants and reduce air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during summer months and periods of agricultural burning. Avoiding strenuous outdoor activity during dust storms is crucial. Staying indoors with windows closed and using air purifiers can help mitigate exposure. Hydration is also essential to combat the dry air and potential respiratory irritation. The lack of consistent rainfall throughout the year means that natural cleansing of the atmosphere is limited, making meteorological conditions the primary driver of air quality fluctuations.