Study on Healthy Risk Assessment of Residential Indoor Environmental in Four Cities in Hunan Province

摘要

The indoor air quality of housing has great influence on the health of residents and the IAQ of residences is most important in various indoor environments.So the indoor air quality directly affects the safety and the health of residents.In the residences,there are lots of volatility organic pollutants,which have carcinogenic risk for the occupants.The formaldehyde and benzene are the most comprehensive existing in the housing with high toxicity.So,it is very important to study the influence of formaldehyde and benzene on different professional residential health in indoor air in the housing of different cities.Through investigating formaldehydes and benzene of the housing in four cities in Hunan province,exposure assessment method is adopted to research into life carcinogenic probability and non-carcinogenic effect of formaldehyde and benzene in indoor air on the different types of people.It is discovered that though the concentration of formaldehyde and the benzene in the residences is below national standard they can also produce great carcinogenic risk and have non-carcinogenic effect on human body.The most serious contaminant is formaldehyde in housing,which causes the highest lifetime cancer probability (LCP) of 5.36E-04,oversteping 2 quantity magnitude levels that can be accepted.At the same time,the highest chronic healthy effect is 3.27,which can not be neglected either.Therefore it is essential to distinguish the formaldehyde source and carry out the force standard.For different professional people in different cities,there are great discrepancies in carcinogenic risk level of formaldehyde and benzene,and the level has exceeded the acceptable carcinogenic risk.It needs the residents to change ways of life and improvement indoor and environmental consciousness to reduce carcinogenic risk.