By World Health Organization
This booklet provides revised guide values for the 4 commonest air toxins - particulate topic, ozone, nitrogen dioxide and sulfur dioxide - in keeping with a contemporary assessment of the collected medical proof. the explanation for number of each one guide price is supported by means of a synthesis of data rising from examine at the well-being results of every pollutant. accordingly, those guidance now additionally practice globally. they are often learn at the side of Air caliber instructions for Europe, 2d variation, that's nonetheless the authority on guide values for all different air pollution.
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Extra info for Air Quality Guidelines: Global Update 2005, 2007th Edition
Begum BA et al. Investigation of sources of atmospheric aerosol at a hot spot area in Dhaka, Bangladesh. Journal of the Air & Waste Management Association, 2005, 55:227–240. 30 AIR QUALITY GUIDELINES 16. Urban air pollution. Washington, DC, World Bank, 2004 (South Asia Urban Air Quality Management Briefing Note No. 14). 17. Air Quality Expert Group. Nitrogen dioxide in the United Kingdom. London, Department of Environment, Food and Rural Affairs, 2004. 18. Harrison RM. Chemistry and climate change in the troposphere.
As with nitrogen dioxide, ozone concentrations generally do not show a tendency to fall. Overall, the hemispheric background concentration of tropospheric ozone is increasing. Rising concentrations have been recorded for North American and European cities, and levels exceeding WHO’s 2000 guideline values have been reported from cities in Mexico, Latin America, Africa, Australia and Europe. One of the trends predicted to lead to increasing air pollution levels is the high rate of urbanization in countries where most of the population is on low income.
Ambient air pollution consists of a highly variable and complex mixture of different substances, which may occur in the gas, liquid or solid phase. Several hundred different components have been found in the troposphere, many of them potentially harmful to human health and the environment. Institutions such as environmental agencies around the world have developed a core set of air pollution indicators and criteria pollutants, which have been widely used to characterize air quality. 5) • nitrogen dioxide • sulfur dioxide • ozone.