Global over 80% cities air pollution levels exceed WHO recommended standards
zhongguokejiwangkeji· 2016-05-13 08:58:44
< p >, the original title: over 80% of urban air pollution levels exceed world health organization standards recommend < p < p > [introduction] World Health Organization 12 update urban air quality database show that in 103 countries and regions worldwide 3000 multiple monitoring air quality in the city, the pollution levels of the more than 80% in urban air particulate matter (PM10) and fine particulate matter (PM2.5) over the criteria suggested by the World Health Organization. < p > original title: over 80% of urban air pollution exceeded < p < p > Xinhua Geneva, May 12 (reporter Zhang Miao), the World Health Organization 12 update of the urban air quality database. In 103 countries and regions worldwide 3000 multiple monitoring air quality of the city, the pollution levels of the more than 80% in urban air particulate matter (PM10) and fine particulate matter (PM2.5) over the criteria suggested by the World Health Organization. < p > particles and fine particulate matter components including sulfate, nitrate of silver and black carbon and other pollutants, they can penetrate deep into the lungs and cardiovascular system and increase the risk of stroke, heart disease, lung cancer and asthma, acute and chronic respiratory disease risk. Who said that over the past two years, with more cities began to measure the level of air pollution, related database size almost doubled. < p > data show that the middle and low income countries urban air pollution problems in higher income countries is much more serious, it has a population of more than 10 million urban air pollution levels exceed the proportion of the number of cities of the world health standard, low - and middle-income countries was 98%, but in high income countries was 56%.
new database covers 210 large and medium sized cities in China particulate matter and fine particle data. In the population of more than 14 million of the world's mega cities, 2011 to 2015 monitoring data show that Delhi, Cairo, Dhaka, Calcutta, Mumbai is the world's highest level of particulate pollution of the 5 major cities.
who according to the latest data also compared the 67 countries and regions, a total of 795 cities in 2008 to 2013 years of pollution trends of particulate matter and fine particulate matter.
who stressed that particulate matter and fine particulate matter concentration caused by environmental pollution is a major risk to health, leading to the world's about 3000000 premature deaths each year. But if the particulate matter pollution from 70 micrograms per cubic meter down to 20 micrograms, due to air pollution related deaths could be reduced by about 15%. < p > according to the World Health Organization recommended air quality standards, the air can be inhaled particulate matter in the mean should be less than or equal to 20 micrograms per cubic meter, 24 hours mean value is less than or equal to 50 micrograms per cubic meter; fine particulate matter annual average value should be less than or equal to 10 micrograms per cubic meter, 24 hours average less than 25 micrograms per cubic meter.
Public acceptance of genetically modified technology significantly decreased
The expedition team or uncover the "bend Pyramid" in the secret
Shanghai science and technology week will welcome Chinese and foreign...