Arakkonam Air Quality Index (AQI)

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Arakkonam occupies a strategic position in Tamil Nadu's Tiruvallur district, situated approximately 70 kilometres west of Chennai along the bustling Chennai-Bangalore corridor. The city lies within the flat coastal plains of eastern Tamil Nadu at an elevation of just 84 metres above sea level, creating a topographical basin effect that traps pollutants. Its location places it within the Palar River basin, though the river typically runs dry for much of the year, contributing to dust resuspension during dry periods. Arakkonam serves as a crucial railway junction connecting southern India to Chennai Port, with extensive diesel locomotive operations generating significant emissions. The city's urban character blends administrative functions with industrial activity, featuring a distinct industrial zone that processes agricultural products from the surrounding fertile plains while emitting industrial pollutants. Surrounding landscapes transition from urban development to agricultural fields growing rice, sugarcane, and pulses, creating an urban-rural gradient where farm residue burning occasionally adds to pollution loads. Proximity to the Bay of Bengal (about 100 kilometres east) provides some maritime influence, but this is often insufficient to disperse pollutants effectively due to the city's inland position. The naval air station to the north adds aviation emissions, while National Highway 16 brings continuous vehicle traffic through the city centre, creating multiple pollution corridors that converge in this geographically constrained setting.

Arakkonam's air quality follows distinct seasonal patterns shaped by its tropical wet-and-dry climate. During the northeast monsoon season from October to December, reduced wind speeds and frequent temperature inversions trap pollutants near the surface, causing pollution to accumulate progressively. November through February represents the peak pollution period when cool, stable atmospheric conditions prevent vertical mixing, allowing emissions from vehicles, industry, and the naval air station to concentrate. These months feature hazy conditions with reduced visibility, making them particularly challenging for outdoor activities. Sensitive groups including children, elderly residents, and those with respiratory conditions should limit prolonged exposure during morning and evening hours when inversions are strongest. The summer months from March to May bring extreme heat that accelerates photochemical reactions, transforming primary pollutants into secondary pollutants like ozone, though stronger daytime convection provides some dispersion relief. The southwest monsoon from June to September offers the cleanest air as heavy rains wash pollutants from the atmosphere and persistent winds from the Arabian Sea provide effective ventilation. Residents should plan outdoor exercise for monsoon months when air quality is most favourable, while remaining vigilant for cyclone-related disruptions that can temporarily worsen air quality through debris and construction material dispersion.