Fossil fuel burning releases about 25 Pg of CO2 per year into the atmosphere, which leads to global warming (Prentice et al., 2001). However, it also emits 55 Tg S as SO2 per year (Stern, 2005), about half of which is converted to sub-micrometer size
sulfate particles, the remainder being dry deposited. Recent research has shown that the warming of earth by the increasing concentrations of CO2 and other greenhouse gases is partially countered by some backscattering to space of solar radiation by

High levels of air pollution in Johannesburg in winters and the rising exhaust emissions on its roads has prompted the city to adopt stringent air-quality measures. Atmospheric scientist Margot

In Iceland, the

South Asian emissions of fossil fuel SO2 and black carbon increased