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Environment
20
Feb
2013
Xi'ans Air Quality Index (AQI) E-mail
Magazine - Environment
Written by ND
An air quality index (AQI) is a number used by government agencies to communicate to the public how polluted the air is currently or how polluted it is forecast to become. As the AQI increases, an increasingly large percentage of the population is likely to experience increasingly severe adverse health effects. Different countries have their own air quality indices which are not all consistent. Different countries also use different names for their indices such as Air Quality Health Index, Air Pollution Index and Pollutant Standards Index. Air quality is defined as a measure of the condition of air relative to the requirements of one or more biotic species or to any human need or purpose.

To compute the AQI requires an air pollutant concentration from a monitor or model. The function used to convert from air pollutant concentration to AQI varies by pollutant, and is different in different countries. Air quality index values are divided into ranges, and each range is assigned a descriptor and a color code. Standardized public health advisories are associated with each AQI range.

 
15
Jan
2013
Dangerous Breathing E-mail
Magazine - Environment
Written by ND
We came across a shocking but very interesting document: It is a summary of a report released by Greenpeace China, that studies the health risks and economic loss linked to PM2.5 in four major Chinese cities (among them Xi'an), and assesses the potential public health and economic benefits given effective improvement of PM2.5 pollution control under different scenarios.

The report is called "Dangerous Breathing - PM2.5: Measuring the human health and economic impacts on China's largest cities" and it was published in December 2012. It is the first of its kind, based on currently available research findings and data in relation to PM2.5 in Shanghai, Guangzhou, Xi’an and Beijing, respectively elected as four major cities in Eastern, Southern, Western, and Northern China.

 


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