Natural pollution has been present on earth since before man appeared. It is still a factor to be considered when discussing air pollution, although it causes only a small percentage of the present overall pollution problem existing in our country. Natural pollution is the direct result of decaying organic matter, wind born smoke and particulates from such natural events as plains and forest fires (ignited by heat or lightning), volcanic ash, sand and dust which spreads over a large area of the countryside.
Such a phenomenon of natural pollution has included recent volcanic eruptions, with the resulting plume of smoke, steam and volcanic ash blotting out the sun's rays as it spreads and rises higher into the atmosphere. There, the upper air currents catch and carry the smoke and ash, while condensing the steam back into water vapor. As the water vapor, smoke and ash travel on their journey, the smoke dissipates into the atmosphere while the ash and moisture settle back to earth in a trail hundreds of miles long. In many cases, lives are lost and millions of dollars of property damage result. Ironically, man can only stand by and watch it happen.