Exposure to particulate matter in transport micro-environments: A comparison between Pakistan and the United Kingdom.

Ian Colbeck and Zaheer Ahmad Nasir

Exposure to various air pollutants depends largely on their concentrations and amount of time spent by the people in a specific micro-environment. Among a wide range of micro-environments, the transport micro-environment is of great importance due to repeated exposure. To understand the dynamics of particulate pollution in transport micro-environments in developed and developing countries, an investigation was carried out in Pakistan and the United Kingdom. In the UK concentrations of PM10, PM2.5 and PM1 in a car were generally similar during both morning and evening journeys with average values of 21 µg/m3 for PM10, 8 µg/m3 for PM2.5 and 6 µg/m3 for PM1. In Pakistan overall journey-time levels of PM10, PM2.5, PM1 and PM10-2.5 were 103 mg/m3 , 50 mg/m3, 38 mg/m3 and 53 mg/m3 as compared to 489 mg/m3, 91 mg/m3, 52 mg/m3 and 397 mg/m3 at fixed sites.

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