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Measurement of Atmospheric Concentrations of CO, SO , NO and NOx in Urban Areas of Karachi City, Pakistan: Inorganic Ion Concentrations in Urban Karachi Atmosphere. Pakistan Journal of Scientific & Industrial Research. 2010;53(1):25-29. Accessed March 10, 2026. https://www.v2.pjsir.org/index.php/biological-sciences/article/view/415