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Kaïs, nestled within the Khenchela Province of Algeria, occupies a geographically significant position in the northeastern part of the country. Located at approximately 35.4947° latitude and 6.9242° longitude, the city sits at an elevation of roughly 1100 meters (3609 feet) above sea level, placing it within the foothills of the Aurès Mountains. This elevated terrain plays a crucial role in shaping the local climate and influencing air quality. The surrounding landscape is characterized by a mix of semi-arid scrubland, rocky outcrops, and pockets of agricultural land, primarily focused on cereal cultivation and olive groves. The urban–rural gradient transitions relatively quickly, with the city bordered by sparsely populated rural areas. While Kaïs lacks direct proximity to major bodies of water, it benefits from occasional moisture-laden winds originating from the Mediterranean Sea, though these are often disrupted by the intervening mountain ranges. There are no major industrial belts immediately adjacent to Kaïs; however, the broader Khenchela Province does have some mining activity and limited agricultural processing, which can contribute to regional air pollution. The city’s relatively small size (population 28,724) means that local emissions from vehicles and residential heating are the primary drivers of air quality concerns, exacerbated by the topography which can trap pollutants under certain meteorological conditions. The Aurès Mountains to the north and east act as a barrier, potentially hindering the dispersion of pollutants, particularly during periods of low wind speed.

Kaïs experiences a semi-arid climate with distinct seasonal variations that significantly impact air quality. The dry season, spanning roughly from October to April, is characterized by clear skies, low humidity, and frequent temperature inversions, especially during the colder months. These inversions, where a layer of warm air traps cooler air near the ground, can lead to a build-up of pollutants, particularly particulate matter from residential heating (often using wood or charcoal) and vehicle emissions. November through February are typically the months with the greatest potential for stagnant air and elevated pollution levels. The transition to the warmer months (May to September) brings increased temperatures and generally more frequent wind, which helps to disperse pollutants. However, dust storms originating from the Sahara Desert can occasionally impact air quality during this period, introducing significant amounts of particulate matter. Spring (March-April) sees a slight increase in humidity and occasional rainfall, which can help to cleanse the air. Summer (June-August) is generally the most favourable time for outdoor activities, although intense heat can still pose a health risk. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should be particularly cautious during the cooler, drier months, limiting prolonged outdoor exposure and avoiding strenuous activity when air quality is visibly poor. Residential wood burning should be minimized during periods of temperature inversion to reduce local pollution.