Miorimivalana Air Quality Index (AQI)

Loading live AQI data...

Loading historical AQI trends...

Miorimivalana, a small city nestled within the Toamasina province of Madagascar, presents a unique geographic context influencing its air quality. Located at approximately -17.2219 latitude and 49.2050 longitude, the city sits relatively close to the Indian Ocean, approximately 25km inland. The terrain is gently undulating, characteristic of the eastern coastal plains of Madagascar, with an elevation generally below 100 meters. This proximity to the ocean introduces a consistent, humid air mass, but also potential for salt spray and marine aerosols. The surrounding landscape is dominated by agricultural zones, primarily small-scale farming of rice, vanilla, and cloves, alongside patches of remnant rainforest. While Miorimivalana isn’t a major industrial hub, the port city of Toamasina, a significant industrial and trading centre, lies nearby, creating a potential source of transported pollutants. The urban-rural gradient is quite sharp; the city itself is compact, quickly transitioning to agricultural land. This means limited natural dispersion of pollutants, particularly during calm weather conditions. The prevailing winds, generally from the east-southeast, can carry pollutants from Toamasina towards Miorimivalana, impacting local air quality. The lack of significant topographical barriers further exacerbates this issue, allowing pollutants to spread relatively freely.

Miorimivalana experiences a tropical monsoon climate, dictating a distinct wet and dry season rather than traditional four seasons. Air quality generally improves during the wet season (November to April) due to increased rainfall which effectively washes particulate matter from the atmosphere. However, high humidity can also promote the formation of mold and mildew, potentially impacting respiratory health. The dry season (May to October) consistently presents poorer air quality. This is driven by increased dust from agricultural activities – land preparation, harvesting – and a greater concentration of pollutants from nearby Toamasina, as winds are less effective at dispersing them. Temperature inversions, common during the cooler, drier months of July and August, trap pollutants near ground level, worsening conditions. The months of September and October are typically the most challenging for air quality, coinciding with the peak of agricultural burning for land clearing. Sensitive groups, including children, the elderly, and those with pre-existing respiratory conditions, should limit strenuous outdoor activity during these periods. Monitoring wind direction is crucial; winds from the direction of Toamasina indicate a higher likelihood of pollution. Fog, common in the early mornings, can also exacerbate respiratory issues by trapping pollutants.