Figure 1
From: Air pollution in Boston bars before and after a smoking ban
Measurements of respirable particle (RSP) and carcinogen pollution (PPAH) as a function of time before the Boston smoking ban on Friday, April 18, 2003 from 6 PM to 12 AM in 7 hospitality venues. Outdoor levels are indicated between the dotted lines showing the levels in each pub. Contrast with Figure 2.