Abstract 15212: The Effect of São Paulo's Smoke-free Legislation on Carbon Monoxide Concentration in Hospitality Venues and Their Workers.
Background: Several recent studies have clearly shown that no level of exposure to secondhand smoke (SHS) is safe, and a close link exists between SHS and the risk of coronary heart disease and stroke. Carbon monoxide (CO) is one of the most dangerous components present in SHS, and also related to pathogenesis of cardiovascular risk.
Objectives: To evaluate the impact of the smoking ban law in São Paulo city, Brazil, on the CO concentration in restaurants, bars, nightclubs, and similar venues as well as in workers of these places.
Methods: In the present study we measured the CO concentration in 585 hospitality venues by using portable CO monitors to measure CO concentration in different environments (indoor, semi-open, and open areas), as well as in the exhaled air from approximately 600 workers of such venues. These measurements were performed twice, before and 12 weeks after the law was implemented. We verified the quality of the air in the city during the same period of our study through the air quality databank from the Environmental Agency of São Paulo (CETESB).
Results: The CO concentration pre and post-ban in hospitality venues was indoor area 4.57 (3.70) vs 1.35 (1.66) ppm (p>0.0001); semi-open 3.79 (2.49) vs 1.16 (1.14) ppm (p>0.0001); open area 3.31(2.2) vs 1.31(1.39) ppm (p>0.0001); smoking workers 15.78 (9.76) vs 11.50 (7.53) ppm (p>0.0001); and non-smoking workers 6.88 (5.32) vs 3.50 (2.21) ppm (p>0.0001). The average CO concentration measured by CETESB in 9 automatic stations in the city was lower than 1 ppm during the pre and post-ban periods.
Conclusions: São Paulo' smoke-free legislation significantly reduced the CO concentration in hospitality venues and in their workers, whether they smoke or not. The quality of the air in the city during the study did not influence the results.
- © 2010 by American Heart Association, Inc.