The world health organization (who) has released the latest urban air quality, according to the database in the global 103 countries and regions, more than 3000 monitoring air quality in the city, more than 80% of the city air particulate matter (PM10) and fine particulate matter (PM2.5) pollution levels exceeding the standards recommended by who.Relevant experts pointed out that air pollution is a global “city disease”, improve air quality need to advocate public transportation, improve the efficiency of energy utilization, clean energy development and other aspects.More than 80% of urban polluting air pollution into a global “city disease”The world health organization on May 12, according to the urban air quality database updates in the global 103 countries and regions, more than 3000 monitoring air quality in the city, more than 80% of the city in the air particulate matter (PM10) and fine particulate matter (PM2.5) pollution levels exceeding the standards recommended by who.
Particulate matter and the composition of fine particulate matter such as sulphate, nitric acid silver and black carbon contaminants, they can further pulmonary and cardiovascular systems, increase the risk of stroke, heart disease, lung cancer and the risk of acute or chronic respiratory disease including asthma.Who said that over the past two years as more cities began to measure air pollution levels, related database scale almost doubled.Figures show that in low and middle-income countries city is much more serious problem of air pollution is higher income countries, are air pollution levels of cities with a population of more than 100000 more than who standard in proportion to the number of cities, in low and middle-income countries is 98%, 56% in high-income countries.In a population of more than 14 million of the world’s megacities, according to monitoring data from 2011 to 2015 in Delhi, Cairo, dhaka, kolkata, mumbai is the world’s highest particulate matter pollution levels five megacities.Who, according to the latest data also compares the 67 countries and regions, a total of 795 cities in 2008 ~ 2013 particles and fine particulate matter pollution trend.Who point out that, although some areas have improved, but the overall level of the global air pollution in cities rose 8%.Who stressed that the particulate matter and fine particulate matter pollution from highly concentrated is a big risk to health, leading to more than 300 ten thousand premature deaths worldwide every year.But if the particulate matter pollution from 70 micrograms per cubic meter drop to 20 micrograms per cubic meter, related deaths caused by air pollution might be reduced by about 15%.Suggestions according to the who air quality standard, average of particulates in the air should be less than or equal to 20 micrograms per cubic meter, 24-hour average is less than or equal to 50 micrograms per cubic meter;Fine particulate matter in average should be less than or equal to 10 micrograms per cubic metre, average no more than 24 hours per cubic meter of 25 micrograms.(source: China environment news)
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