Carbonaceous aerosols play an important role in the Earth’s radiative balance and in climate [IPCC, 2007]. Second only to CO2, in terms of direct climate forcing, black carbon (BC) is believed to be a principal component of global warming through absorption of solar radiation since its warming effect has been found to balance the net cooling effect of other anthropogenic aerosols [Lindberg et al., 1999; Jacobson, 2001]. Chung and Seinfeld [2002] estimated Black Carbon global burden is 0.22 Tg with a lifetime of 6.4 d, and predicted that the globally averaged top of the atmosphere (TOA) radiative forcing by anthropogenic BC is 0.51–0.8 W m
−2
2
.