Loading air quality context...

Al Līth, nestled within the Makkah Province of Saudi Arabia, occupies a geographically significant position in the Hijaz region, a mountainous area bordering the Red Sea. Located at approximately 20.1480° N, 40.2722° E, the city sits at an elevation of around 850 meters (2,789 feet) above sea level, contributing to a cooler climate compared to lower-lying areas of the Kingdom. The surrounding landscape is dominated by rugged, arid mountains, part of the Sarawat range, which significantly influence local weather patterns and air circulation. This terrain creates a natural basin effect, potentially trapping pollutants under certain meteorological conditions. While Al Līth is not directly adjacent to the Red Sea, its proximity (roughly 50km) means that sea breezes can occasionally influence air quality, though the mountainous barrier often disrupts this effect. The urban–rural gradient transitions rapidly from the city's concentrated population to sparsely populated agricultural terraces carved into the hillsides, supporting date palm cultivation and limited livestock farming. There are no major industrial belts immediately surrounding Al Līth; however, the broader Makkah region experiences industrial activity related to construction, pilgrimage services, and some light manufacturing, which can contribute to regional air pollution transported by prevailing winds. The city’s location within a valley further exacerbates the potential for stagnant air and pollutant accumulation, particularly during periods of low wind speed. The unique topography dictates a complex interplay of local and regional air quality factors.

Al Līth experiences a distinct wet and dry season pattern, heavily influencing its air quality profile. The wet season, typically from October to March, brings occasional rainfall and a noticeable improvement in air quality. The precipitation helps to wash away particulate matter and reduce dust levels, a significant contributor to pollution in the region. However, the increased humidity can sometimes lead to the formation of ground-level ozone, particularly during periods of intense sunlight following rainfall. The dry season, from April to September, is characterized by high temperatures, low humidity, and frequent dust storms originating from the Arabian Peninsula’s deserts. These dust events dramatically degrade air quality, increasing particulate matter concentrations and reducing visibility. Temperature inversions are common during the cooler months (November-February), trapping pollutants near the ground, especially within the valley’s topography. During these inversions, pollutants from nearby urban areas and industrial activities can accumulate. The months of June, July, and August are generally the most challenging for air quality due to the combined effects of high temperatures, low wind speeds, and potential dust storms. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor activity during these periods and monitor local air quality reports. Even during the wetter months, those with asthma or allergies should remain vigilant, as pollen and mold spores can be elevated following rainfall.