CNN.com - Study finds dandruff in?air pollutants - Mar 31, 2005

It seems that biological cellular material once thought to be insignificant in terms of air pollutents i.e. aerosols now make up a significant minority 40% thereabouts.

*Snigger* I suppose this would entitle Proctor & Gamble to claim in their next Head and Shoulder's Anti-Dandruff shampoo to be environmentally friendly and helpful with the climate change problem.