Pollution Characteristics,Combined Effects Of Temperature And Humidity,and Exposure Risks Of Volatile Organic Compounds In Indoor Air

In recent years,more and more attention has been paid to the quality of atmospheric environment.People spend most of their time indoors;the concentrations of main indoor pollutants could be 5 to 10 folds more than that of outdoor;and more than 60%of human diseases are related to indoor pollution.Therefore,indoor air quality more directly affects our health.Since the last century,with the development of interior decoration materials,daily necessities,and the transformation of lifestyle,significantly changed the types and concentrations of indoor air pollutants,so that people in various types of indoor environments are generally exposed to air pollutants.This dissertation has conducted the research on the concentrations of typical organic pollutants in indoor air,pollution characteristics,the release of the law and their risks of human exposure.Through a comparative study of more than 2000 indoor air samples from two typical cities in Hangzhou and Xi'an,the concentration levels and pollution characteristics of the main pollutants in the newly renovated residences in the two places above were investigated.Combined with theoretical analysis found that indoor VOC level is influenced by combined effects of temperature and humidity.Among them,the combined effects of temperature and humidity on indoor air pollutants are mainly manifested as source effect and sink effect,and different pollutants are related to different types of the main effect.Different from "the temperature and humidity effect" of indoor formaldehyde,combined effects of temperature and humidity of indoor VOCs and their components are associated to the water solubility,molecular structure(polarity),and the Henry's Law Constant,especially for the component with small water solubility,low-polarity,and large Henry's Law Constant.And the combined effects of indoor VOCs shares significant linear relationship with the Henry's Law Constants.Finally,the exposure levels and exposure risks have been compared among the major indoor pollutants,and it's found that the potential exposure risk of female is larger than that of male.The conclusions of above study have some values for revealing and understanding the phenomena and causes of pollutant concentration in indoor air under high temperature andwetted environment as well as the measures to control and reduce indoor air pollution.This study also show some values to better understand the migration-transformation processes and rules of indoor VOC pollutants,for the indoor VOC diffusion model and its pollution control to provide some theoretical supports.