Wash U Releases Secondhand Smoke Study Today

http://www.stltoday.com/news/science/article_5cbb6762-bb36-11df-85d7-00127992bc8b.html

Very few St. Louis establishments have adequate air purification systems installed to deal with secondhand smoke. The Double D Lounge has the best system of any bar in St. Louis City or County. That system runs 24/7 and is scrupulously maintained. Wash U didn't study the Double D Lounge. So what can this study tell us except that bars with lousy ventilation and no purification systems are smoky?

If this study finds that ventilation and air purification are ineffective against secondhand smoke, then why does OSHA allow workplaces to clear car exhaust and welding smoke with the same technology? Why does Barnes hospital use the same technology to keep its operating rooms free of viruses and bacteria?