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Concentrations of black carbon, [BC], were determined with an Aethalometer every 5min at Lahore, a city of about 10 million in Pakistan, from 22 November 2005 to 31 January 2006. [BC] were very high, ranging from about 5 to 110μgm-3, with a mean of 21.7μgm-3. A distinct diurnal variation was observed: concentrations were lowest from about 10 a.m. to 4 p.m. local time (LT), and highest around 5–9 p...
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