Mazenod, nestled within the Maseru District of Lesotho, occupies a geographically significant position within the Maloti Mountains. Located at approximately -29.4642° latitude and 27.4969° longitude, the city sits at a considerable elevation, averaging around 1,800 meters (5,900 feet) above sea level. This high altitude profoundly influences its climate and, consequently, its air quality. The surrounding landscape is dominated by steep, rugged terrain, characteristic of the Drakensberg mountain range, limiting expansive agricultural practices immediately adjacent to the urban area. While the city isn't directly adjacent to a major river, it draws water from mountain streams and springs, contributing to a relatively humid microclimate. The urban–rural gradient transitions rapidly; Mazenod quickly gives way to sparsely populated highland pastures and traditional Basotho villages. The region's economy is primarily reliant on subsistence agriculture (livestock farming and small-scale crop cultivation) and remittances, with limited heavy industry. This reduces the potential for large-scale industrial pollution, though burning of vegetation for land clearing and livestock management can contribute to localized air quality issues. The mountainous topography creates a natural barrier, potentially trapping pollutants under certain meteorological conditions, especially during periods of temperature inversion. The prevailing winds, often channeled through the valleys, can also concentrate pollutants in specific areas of the city. The limited flat land restricts urban sprawl, but also concentrates emissions within a smaller area.

Mazenod experiences a distinct seasonal pattern influencing its air quality. The climate is generally cool, with warm summers (November to February) and cold winters (May to August). During the dry winter months, characterized by clear skies and minimal rainfall, temperature inversions are more frequent. Cold, dense air settles in the valleys, trapping warmer air and any associated pollutants aloft. This can lead to periods of stagnant air and increased concentrations of particulate matter, particularly from residential wood-burning stoves used for heating. Spring (September to October) brings increased wind speeds as the weather system shifts, dispersing pollutants and generally improving air quality. Summer sees increased convective activity and occasional thunderstorms, which also help to cleanse the atmosphere. However, agricultural burning, a common practice for land preparation, can contribute to localized smoke events. Autumn (March to April) is a transitional period, with decreasing temperatures and increasing humidity, potentially leading to fog formation, which can trap pollutants near ground level. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during winter months, limiting outdoor activity on days with visibly hazy conditions. During the summer months, be mindful of smoke from agricultural practices and avoid prolonged exposure to areas with visible smoke. The relatively high elevation means that UV exposure is significant year-round, so sun protection is always recommended, regardless of air quality.