The who air quality guidelines: global update 2005 provide an assessment of health effects of air pollution and thresholds for health-harmful pollution levels in 2016, 91% of the world population was living in places where the who air quality guidelines levels were not met. Air quality in sacramento county the sac metro air district is responsible for cleaning the air to meet state and federal health standards so we all breathe easier the area's two biggest air pollutants are ground-level ozone and particulate matter 25. The effects of air pollution wreck havoc on human health and our planet as a whole learn about what causes air pollution and how to help reduce the effects air pollution: everything you need. Air quality guidelines have been published by who in 1987 and they were revised in 1997 given the wealth of new studies on the health effects of air pollution that have been published in the scientific literature since the completion of the second edi¬tion of the air quality guidelines for europe, includ¬ing important new research from low.
Who air quality guidelines 5 preface clean air is considered to be a basic requirement of human health and well-being however, air pollution continues to pose a significant threat to.
Air pollution comes from many different sources: stationary sources such as factories, power plants, and smelters and smaller sources such as dry cleaners and degreasing operations mobile sources such as cars, buses, planes, trucks, and trains and naturally occurring sources such as windblown dust, and volcanic eruptions, all contribute to air pollution. The clean air act, which was last amended in 1990, requires epa to set national ambient air quality standards (40 cfr part 50) for pollutants considered harmful to public health and the environment the clean air act identifies two types of national ambient air quality standards. Great progress has been made in achieving national air quality standards, which epa originally established in 1971 and updates periodically based on the latest science one sign of this progress is that visible air pollution is less frequent and widespread than it was in the 1970s however, air.
Through this program, air quality samples are collected to judge attainment of ambient air quality standards, to prevent or alleviate air pollution emergencies, to observe pollution trends throughout regions, and to evaluate the effects of urban, land-use, and transportation planning relating to air pollution.