tailieunhanh - Indoor Air Pollution: An Overview

Other studies, primarily with laboratory animals, suggest that the chemical composition5 and surface areas of the particles may be more important than particle mass. Scientists are continuing to study the health effects of particles and are developing better methods for measuring the important constituents. It may be possible in the near future to more accurately assess the effects of inhaled particles on human health. Nitrogen Oxides Nitrogen oxides are produced during most combustion processes. Mobile sources and power plants are the major contributors in Southern California. About 80 percent of the immediately released nitrogen oxide. | Indoor Air Pollution An Overview Indoor Air Pollution An Overview Indoor Air Pollution An Overview We ve all heard the warnings about the risks of indoor air pollution on health comfort learning and productivity especially to children and those in sensitive populations groups. In response many manufacturers have reformulated their products to be less polluting but are challenged by a lack of universal indoor air quality IAQ regulations and standards. Significant differences in criteria among various eco labels and product certification programs around the world further complicate an already complex landscape of IAQ concerns. In addition building designers specifiers and consumers are challenged by the overwhelming amount of information some of which is contradictory and or filled with unsubstantiated marketing claims greenwashing . Reviewing the basics about the most prevalent and dangerous types of indoor air pollutants associated with indoor materials and products adds some clarity and sharpens the focus on what strategies really work to create and maintain healthy indoor environments. Volatile Organic Compounds VOCs Volatile organic compounds VOCs are the most prevalent indoor air pollutants that originate from products and building materials. Air Quality Sciences AQS for example has measured VOC levels in more than 2 000 different environments and emissions from over 65 000 different materials and furnishings. As a result more than 12 000 unique VOCs have been identified in product emissions studies and the majority of these VOCs have been found in buildings. Tables 1 and 2 list the most common VOCs found in green construction and in schools respectively. Results from a growing body of research suggest that chemical emissions from common indoor materials and finishes have a variety of adverse effects including increased risk of asthma pulmonary infections and allergies Mendell 2007 . Chemicals in cleaning products some personal care and other consumer products