The use of tetrachloroethylene as a dry cleaning agent, chemical intermediate, and metal degreasing agent has led to its release to the environment. It has also been shown to be produced naturally by several temperate and subtropical marine macroalgae, but the majority of exposure to tetrachloroethylene is still through anthropogenic sources. It is primarily released to the air where it is slow...

UNLABELLED Indoor air quality (IAQ) parameters in 64 elementary and middle school classrooms in Michigan were examined for the purposes of assessing ventilation rates, levels of volatile organic compounds (VOCs) and bioaerosols, air quality differences within and between schools, and emission sources. In each classroom, bioaerosols, VOCs, CO(2), relative humidity, and temperature were monitored...

The purpose of ventilation is dilute or remove indoor contaminants that an occupant is exposed to. In a multi-zone environment such as a house, there will be different dilution rates and different source strengths in every zone. Most US homes have central HVAC systems, which tend to mix the air thus the indoor conditions between zones. Different types of ventilation systems will provide differe...

Exposure to air pollution in city centers is of major concern because of its health-risks to urban dwellers, trafficcorridor users and even to in-transit commuters. The steady growth in traffic is the major source of toxic air pollutants in urban centers these days. Therefore, studying exposure to air pollutants in urban centers is of special interests to environmental health scientists. This s...

air conditioning is widely applied for the improvement of standard of living in human life. this present investigation focused on the prediction of indoor air quality characteristics of air conditioned car using fuzzy logic algorithm. the conditioned space was selected and the experiments were planned as per design of experiments to study the effect of human load, fresh air supply and air veloc...

background: radon (222rn) measurement in the residential environments is very important because of its effecting on human health and causing cancer in the respiratory system. 222rn is individually responsible for half of the natural radiation received in humans and influences on human by breathing. hence, this study was undertaken to access the 222rn level in the dormitories of kerman universit...

Indoor corrosion failures of aluminum-finned copper-tube evaporator coils, and also in some systems without aluminum fins, is a menacing issue in the heating, ventilation, and air conditioning (HVAC) industry. Extensive laboratory testing has verified the development of a reproducible screening method to assess suspected contaminants of producing premature failures of copper tube resulting from...

BACKGROUND Indoor air pollution, is the main cause of population exposure to polluting agents. AIM To establish an environmental profile of indoor contamination emission sources in families of children under 5 years that assist to kindergartens in Temuco and Padre Las Casas. To associate respiratory disease episodes in children with indoor contamination. MATERIAL AND METHODS Cross sectional...

Indoor air pollution (IAP) caused by solid fuel use and/or traditional cooking stoves is a global health threat, particularly for women and young children. The WHO World Health Report 2002 estimates that IAP is responsible for 2.7% of the loss of disability adjusted life years (DALYs) worldwide and 3.7% in highmortality developing countries. Despite the magnitude of this problem, social scienti...

Environmental tobacco smoke (ETS) is an aerosol that contains both vapor and particulate phase components. However, due to their nature, the two aerosol phases rarely correlate well. An accurate determination of ETS levels in indoor air, therefore, requires a proper tracer of both phases. One critical aspect of an ideal ETS tracer is that it should “remain in a fairly consistent ratio to the in...