Avaliação da qualidade do ar interior por meio do dióxido de carbono e do formaldeído em escolas de ensino fundamental após obras de construção civil

Abstract

Indoor air quality (IAQ), is relevant in school environments that children with training agencies spend long periods in closed environments. High concentrations ofthe gas carbon dioxide (CO2) and formaldehyde (H2CO) after civil works can compromise the QAI. The aim of this study to evaluate the QAI through H2CO and CO2, elementary school environments, after construction works. The data were collected in four elementary schools, in which construction works occurred recently in different parts of the city of London, in different seasons. The parameters measured were concentration of CO2 and H2CO, temperature and relative humidity, with different types of ventilation, the 1.5 m and also 0, 90 m, soil on Monday, at the time of opening of schools. The statistical treatment of the data used was descriptive statistics, analysis of variance, and correlation of Pearson. The largest variation and range of concentration of H2and CO2 were recorded at the drought. There's weak trend with increasing temperature, decreased the concentration of CO2 and vice versa. The concentration of CO2, were higher in open environment and natural ventilation. The concentrations of H2CO were higher with closed environment, reducing the use of air conditioning and with natural ventilation. Schools in which construction works are newer presented the highest concentrations of H2and CO2. The results of CO2, was overtaking in a single collection of recommendations RE 09/03 by ANVISA. The results of the concentrations of H2CO, exceeded at various times recommendations of international organizations, explaining the need for more restrictive national legislation. The dynamics of concentrations of H2CO, demonstrates that there influence of seasonality, materials contained in environments and post occupancy time civil works. The seasonality and location of the environments influence dynamics of concentration of CO2. Although there are no significant differences in the results with different heights, the differences that have occurred are justified by the proximity of sources of emission in the case of H2CO, and with the air density in the case of temperature and CO2.