“…From the evidence presented so far, we are inclined to hypothesize that the rapid S0 2 oxidation observed in the morning period is caused by incomplete combustion products in the presence of liquid water droplets (Brodzinsky et al, 1980;Chang et al, 1981;Novakov, 1984;Benner et al, 1985). Field evidence supporting this hypothesis was obtained by Eatough et al (1984), who observed rapid sulfate formation when the plume of an oil-burning power plant impacted on a fog bank.…”