Miri Air Quality Index (AQI)

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Miri, a small city in Maharashtra, India (coordinates 19.2800, 74.8400), is situated within the Konkan coastal plain. Its relatively low elevation, typical of this region, contributes to potential air stagnation. The city’s geography is defined by its proximity to the Arabian Sea, influencing humidity and wind patterns. While not directly on the coast, Miri benefits from the moderating influence of the sea breeze, though this can also trap pollutants under certain atmospheric conditions. The surrounding landscape is a mix of agricultural land – primarily rice paddies and horticulture – and pockets of dense vegetation. The urban-rural gradient is fairly sharp, with agricultural activity dominating the immediate periphery. Industrial activity is limited within Miri itself, but the presence of small-scale industries and brick kilns in nearby areas contributes to regional background pollution levels. The terrain is generally flat, with gentle slopes towards the coast, hindering natural dispersion of pollutants. This combination of factors – coastal proximity, limited elevation, agricultural practices, and localized industry – creates a unique set of challenges for maintaining good air quality in Miri. The city’s small population of 15,000 means localised sources have a disproportionately large impact.

Miri’s air quality follows a distinct seasonal pattern dictated by the monsoon and post-monsoon periods. The pre-monsoon months (March to May) typically see the poorest air quality. Rising temperatures create strong convective currents, but also exacerbate dust and particulate matter from agricultural activities and unpaved roads. The lack of significant rainfall during this period allows pollutants to accumulate. The arrival of the southwest monsoon in June brings a temporary respite, as rainfall effectively washes away airborne particles and increased humidity suppresses dust. However, the monsoon can also lead to localised flooding, increasing mould spore concentrations. Post-monsoon (September to November) sees a gradual deterioration as rainfall decreases and temperatures remain warm. This period is often characterised by stagnant air and temperature inversions, trapping pollutants near the ground. Winter months (December to February) experience relatively stable air quality, aided by cooler temperatures and moderate winds, though biomass burning for heating can contribute to localised smoke. Sensitive groups – children, the elderly, and those with respiratory conditions – should avoid strenuous outdoor activity during the pre-monsoon and post-monsoon periods. Monitoring wind direction is crucial, as pollutants can be transported from surrounding areas.