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To study air quality of Chennai city by comparing the air quality index (AQI) with the National Ambient Air Quality Standard (NAAQS) values. In urban area, a major straddling problem is air p o l l u t i o n. A n a l y s e s w a s conducted during Jan 2016-Dec 2017 for PM , SO , NO and CO 2.5 2 2 at different seasons in Manali, Chennai. Fine particulate sampler and Lutron CO meter were used to estimate PM and 2.5 CO levels. Due to different climate changes in India, higher concentration of pollution occurred during summer and m o n s o o n s e a s o n. T h e commercial and residential area experienced lower pollution compared with industrial areas. Case-control study showed that the result of odds ratio was significant. Commercial and traffic may have significant influence on air quality in Chennai. Air Quality Index, Air Pollutants, Epidemiological investigation, Industrial area. Assessment of air quality index of urban area and epidemiological investigations in Chennai

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