INDOOR AND BUILT ENVIRONMENT, vol.18, no.2, pp.130-137, 2009 (SCI-Expanded)
Indoor environments are where people spend 80-90% of their time. They are at their riskiest in terms of air pollution when smoking is not prohibited and various combustion and/or cooking applications are performed. If such environments are where people live or work, or are recreation facilities open to everybody, experience has shown that pollution levels to which they are exposed can reach levels that are a threat to their health.