São Paulo's smoke-free legislation on carbon monoxide concentration

The effect of São Paulo's smoke-free legislation on carbon monoxide concentration in hospitality venues and their workers

• Jaqueline S Issa, 
• Tania M O Abe, 
• Alexandre C Pereira, 
• Maria Cristina Megid,
• Cristina E Shimabukuro, 
• Luis Sergio O Valentin, 
• Marizete M da C Ferreira, 
• Moacyr R C Nobre,
• Ines Lancarotte, 
• Antonio Carlos Pereira Barretto

Tob Control Published Online First: 25 November 2010 doi:10.1136/tc.2010.037614

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Results The CO concentration pre-ban and pot-ban in hospitality venues was indoor area 4.57 (3.70) ppm vs 1.35 (1.66) ppm (p<0.0001); semi-open 3.79 (2.49) ppm vs 1.16 (1.14) ppm (p<0.0001); open area 3.31(2.2) ppm vs 1.31 (1.39) ppm (p<0.0001); smoking employees 15.78 (9.76) ppm vs 11.50 (7.53) ppm (p<0.0001) and non-smoking employees 6.88 (5.32) ppm vs 3.50 (2.21) ppm (p<0.0001). The average CO concentration measured in the city was lower than 1 ppm during both pre-ban and post-ban periods.

Conclusion São Paulo's smoking-free legislation reduced significantly the CO concentration in hospitality venues and in their workers, whether they smoke or not/.../