Lamosina Air Quality Index (AQI)

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Lamosina, nestled within the Fianarantsoa Province of Madagascar, occupies a geographically significant position in the island’s central highlands. Located at approximately -21.6330 latitude and 46.8056 longitude, the city sits at an elevation that contributes to its relatively cool climate compared to coastal regions. The surrounding landscape is dominated by rolling hills and terraced rice paddies, characteristic of the Betsileo region, a major agricultural zone. This proximity to intensive agricultural practices, particularly the burning of crop residues after harvest, represents a key factor influencing local air quality. The urban character of Lamosina is distinctly rural, with a gradual urban–rural gradient extending outwards into the surrounding agricultural lands. While not directly adjacent to a major river, the city benefits from several smaller streams and springs fed by the highland rainfall, contributing to a generally humid environment. The terrain is moderately undulating, which can influence the dispersion of pollutants, potentially trapping them in valleys during periods of low wind. There are no significant industrial belts immediately surrounding Lamosina; however, Fianarantsoa, a larger urban centre approximately 30km away, exerts some influence, with occasional transport of industrial emissions. The prevailing winds generally flow from east to west across the highlands, impacting the distribution of airborne particles and gases. The city’s location within a densely populated agricultural region, combined with its topography, creates a unique set of challenges for maintaining clean air.

Lamosina’s air quality is intrinsically linked to its tropical highland climate, exhibiting a distinct wet and dry season pattern. The dry season, typically spanning from May to October, often sees a noticeable increase in particulate matter. This is largely attributable to agricultural practices; the burning of rice straw and other crop residues after harvest is a common, albeit environmentally impactful, tradition. Reduced rainfall during this period also limits the natural cleansing effect of precipitation, allowing pollutants to persist. Meteorological conditions during the dry season frequently involve temperature inversions, particularly in the mornings, where cooler air becomes trapped in valleys, hindering vertical mixing and concentrating pollutants near ground level. The wet season, from November to April, brings increased rainfall and higher humidity, generally leading to improved air quality as pollutants are washed from the atmosphere. However, periods of heavy fog, common during the wet season, can temporarily reduce visibility and trap moisture-laden pollutants. Wind patterns also play a crucial role; periods of calm winds exacerbate pollution accumulation, while stronger winds facilitate dispersion. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly in the mornings. Outdoor activities are generally more favourable during the wet season, although vigilance regarding fog is advised. The intensity of agricultural burning varies year to year, influenced by rainfall patterns and crop yields, directly impacting the severity of air quality challenges.