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박승엽(Seungyeob Park),박은정(Enu-Jung Park),심수진(Su-Jin Shim),김준현(Junhyun Kim),김수민(Sumin Kim) 한국생활환경학회 2011 한국생활환경학회지 Vol.18 No.5
Many customers inhale second hand smoke in coffee shops because the shops contain smoking areas inside. To analyze indoor air quality levels of carbon dioxide and formaldehyde were measured inside coffee shops. Results revealed that coffee shops have excessive levels of carbon dioxide and formaldehyde. Regarding the methods of ventilation it was discovered that ceiling ventilation reduced carbon dioxide levels by 25% and reduced levels of formaldehyde by 42%. Ventilation by air purifier machines reduced carbon dioxide levels by 51% and formaldehyde levels by 90%. Opening the windows in the smoking areas of coffee shops reduced carbon dioxide levels by 60% and formaldehyde levels by 74%.