Gases Drawn Into Smog Particles Stay There, UCI-led Study Reveals

Airborne gases get sucked into stubborn smog particles from which they cannot escape. The results could explain a problem identified in recent years: Computer models long used by the U.S. Environmental Protection Agency, California air regulators and others significantly underestimate organic aerosols – the major component of smog particles. Such pollution blocks views of mountains and has been linked to everything from asthma to heart attacks.

http://today.uci.edu/news/2012/02/nr_smogpitts_120221.php