RESUMO
BACKGROUND: Studies have shown that there is no safe level of secondhand smoke (SHS) exposure and there is a close link between SHS and the risk of coronary heart disease and stroke. Carbon monoxide (CO) is one of the most important components present in SHS. OBJECTIVE: To evaluate the impact of the smoking ban law in the city of Sao Paulo, Brazil, on the CO concentration in restaurants, bars, night clubs and similar venues and in their workers. METHODS: In the present study we measured CO concentration in 585 hospitality venues. CO concentration was measured in different environments (indoor, semi-open and open areas) from visited venues, as well as, in the exhaled air from approximately 627 workers of such venues. Measurements were performed twice, before and 12 weeks after the law implementation. In addition, the quality of the air in the city during the same period of our study was verified. 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.
Assuntos
Monóxido de Carbono/análise , Exposição Ocupacional/análise , Restaurantes/legislação & jurisprudência , Fumar/legislação & jurisprudência , Poluição por Fumaça de Tabaco/legislação & jurisprudência , Local de Trabalho/legislação & jurisprudência , Adulto , Carga Corporal (Radioterapia) , Brasil , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Exposição Ocupacional/legislação & jurisprudência , Prevenção do Hábito de Fumar , Adulto JovemRESUMO
Background Studies have shown that there is no safelevel of secondhand smoke (SHS) exposure and there isa close link between SHS and the risk of coronary heartdisease and stroke. Carbon monoxide (CO) is one of themost important components present in SHS.Objective To evaluate the impact of the smoking banlaw in the city of Sao Paulo, Brazil, on the COconcentration in restaurants, bars, night clubs and similarvenues and in their workers.Methods In the present study we measured COconcentration in 585 hospitality venues. COconcentration was measured in different environments(indoor, semi-open and open areas) from visited venues,as well as, in the exhaled air from approximately 627workers of such venues. Measurements were performedtwice, before and 12 weeks after the lawimplementation. In addition, the quality of the air in thecity during the same period of our study was verified.Results The CO concentration pre-ban and pot-ban inhospitality venues was indoor...