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An investigational study on the ambient air quality of Aligarh city at six different locations designated as; Sir Syed Nagar, Jamalpur, Dodhpur, Center Point, Numaish Ground, Chungi was performed. Six primary and important locations of Aligarh city were chosen to monitor the quantities of key pollutants like PM10 and PM2.5. The outside areas were susceptible to extraordinary RSPM levels because of prevalent town ambient air excellence of Aligarh city and also due to high road traffic circulation at Dodhpur, chauraha and centre point. The concentration of PM2.5 at Aligarh city atmosphere was observed from 3.5 µg/m³ to 15 µg/m³ and PM10 level of concentrations at all the designated locations varied from 75 - 250 µg/m³. [ABSTRACT FROM AUTHOR]