The airborne carcinogens are in the atmosphere as absorbed matter on soot particles. 空气传播的致癌物在大气中是烟炱粒子上吸附的物质。
Although soot had been found throughout the world, fires need not have erupted everywhere, because soot could have been blown to some sites by the wind. 虽然全世界各地都有发现烟炱，但是火焰却不见得处处都有，因为烟炱有可能是被风带过去的。
