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. 2010 Apr;19(Suppl_1):i16–i20. doi: 10.1136/tc.2009.030718

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Proportion of local smoke-free ordinances by time period. Sources: Americans for Nonsmokers' Rights Local Tobacco Control Ordinance Database, 1970–2008; California's Clean Air Project Secondhand Smoke Policy Database, 2004–2008; The Center for Tobacco Policy and Organizing, 2004–2008.