By World Health Organization
This booklet provides revised guide values for the 4 most typical air toxins - particulate topic, ozone, nitrogen dioxide and sulfur dioxide - in line with a up to date evaluation of the collected clinical proof. the explanation for number of each one guide worth is supported by means of a synthesis of data rising from study at the well-being results of every pollutant. hence, those directions now additionally practice globally. they are often learn along side Air caliber instructions for Europe, 2d variation, that's nonetheless the authority on guide values for all different air pollution.
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Additional info for Air Quality Guidelines: Global Update 2005
Copenhagen, European Environment Agency, 2002. 13. Gurjar BR et al. Emission estimates and trends (1990–2000) for megacity Delhi and implications. Atmospheric Environment, 2004, 38:5663–5681. 14. html, accessed 12 July 2006). 15. 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.
This method uses the measurements of air quality itself, often in combination with simultaneously measured meteorological data, to recognize and quantify the contributions of specific characteristic source types to air pollutant concentrations. In the case of PM, multi-component chemical analyses of consecutively collected air samples allow recognition of components that co-vary in time and therefore have the same source. Typically some 6–10 individual source types can be identified through their chemical profiles.
Sulfur dioxide levels that are already high in some cities in China may increase further, owing to the continued use of coal as a key energy source. Air pollution concentrations are generally higher in northern Chinese cities than in the south. The average sulfur dioxide concentration in 2002 was 52 μg/m3 (45). The national average sulfur dioxide concentration in 2004 was 43 μg/m3, and 22% of cities recorded annual average concentrations above 60 μg/m3. While typical annual average concentrations of sulfur dioxide in urban areas in developing countries are 40–80 μg/m3, those in North America and Europe are 10–30 μg/m3, and in cities in the EU 6–35 μg/m3.
Air Quality Guidelines: Global Update 2005 by World Health Organization