LONDON， May 5 (Xinhua) -- The health benefits of walking and cycling outweigh the harm on health from air pollution， even in cities with high levels of air pollution， according to a study published online Thursday in the journal Preventive Medicine.


Air pollution is one of the leading environmental risk factors for people's health. One of the main sources of air pollution in cities is transport and a shift from cars， motorbikes and buses to active travel， such as walking and cycling， would help to reduce emissions. However， people who walk or cycle in such environments will inhale more pollution， which could be detrimental to their health.


Previous studies conducted in Europe， the United States and several other developed countries found that the health benefits of active travel are greater than the risks， but these were undertaken in areas of relatively low air pollution， and the applicability of their results to more polluted cities in emerging economies has been uncertain.


The new study led by researchers from the University of Cambridge used computer simulations to compare the risks and benefits for different levels of intensity and duration of active travel and of air pollution in different locations around the world， using information from international epidemiological studies and meta-analyses.


Using the data， the researchers calculated that in practical terms， air pollution risks will not negate the health benefits of active travel in the vast majority of urban areas worldwide.


Only one percent of cities in the World Health Organization's Ambient Air Pollution Database had pollution levels high enough that the risks of air pollution could start to overcome the benefits of physical activity after half an hour of cycling every day， according to the study.


"Even in Delhi， one of the most polluted cities in the world -- with pollution levels ten times those in London -- people would need to cycle over five hours per week before the pollution risks outweigh the health benefits，" said Dr Marko Tainio from the University of Cambridge， who led the study.


But a small minority of workers in the most polluted cities， such as bike messengers， may be exposed to levels of air pollution high enough to cancel out the health benefits of physical activity， said Tainio.


This research provides further support for investment in infrastructure to get people out of their cars and onto their feet or their bikes， which can itself reduce pollution levels at the same time as supporting physical activity， according to the researchers.


WUZHISHAN Teuvo Teravainen Hurricanes Jersey , Oct. 27 (Xinhua) -- Andrey Zeits from ASTANA PRO TEAM (AST) became the first rider to cross the finishing line at the 8th stage with a time of 5 hours 15 minutes and 43 seconds.


The 204.8 kilometers 8th stage from Dongfang to Wuzhishan, which is also the queen stage of the event this year, stretched from Dongfang to Wuzhishan, includes three intermediate sprints and three climbs.


Zeits Jaccob Slavin Hurricanes Jersey , winner of this stage also obtained the blue jersey representing best Asian rider, while Sacha Modolo from LAMPRE - MERIDA (LAM) is still wearing the yellow and green jersey as the best rider and sprinter.


Julien EL FARES from TEAM MARSEILLE - 13 - KTM (M13) still keeps the polka-dot jersey as the best climber.


Zeits said, "This is my first win in eight years of my career, so I am very happy today. Thanks to the great work of my teammates from the beginning of the race Victor Rask Hurricanes Jersey , I could stay in peloton and make it possible to win."


This year' s Tour of Hainan will last 9 days, and the next stage and final stage is scheduled on Wednesday, featuring a stretched race from Wuzhishan to Wanning with a total distance of 119 kilometers.


MOSCOW, Oct. 16 (Xinhua) -- Members of the Commonwealth of Independent States (CIS) Scott Darling Hurricanes Jersey , which groups countries of the former Soviet Union, must join efforts to prevent the expansion of terrorism to its territory, Russian President Vladimir Putin said Friday.


Terrorists are gaining more and more influence and do not hide plans of further expansion, and one of their goals is to break into the Central Asian region Elias Lindholm Hurricanes Jersey , Putin told a CIS summit in Kazakhstan.


"It is important to get ready to react in coordination to such a scenario," he said.


Terrorists could penetrate the CIS countries from neighboring Afghanistan, he said, adding that "the situation there is indeed close to being critical".


The Taliban militants have recently increased their activities in Afghanistan Brock McGinn Hurricanes Jersey , seizing some settlements in the north of the country and forcing the government troops to retreat.


U.S. President Barack Obama on Thursday announced plans to keep 5,500 U.S. troops in Afghanistan into 2017, and to maintain the current 9,800 forces through "most of 2016" Sebastian Aho Hurricanes Jersey , which broke his promise to bring all U.S. troops home before leaving office.


Putin also said that the Islamic State (IS) terrorist group operating in Syria and Iraq, which includes 5,000 to 7,000 citizens of Russia and other CIS countries Justin Williams Hurricanes Jersey , presents a real threat to the Commonwealth.


"We definitely cannot permit that the experience they are gaining today in Syria is later applied at home," he stressed.


Meanwhile, Putin reiterated his call for the widest possible coalition to counter extremists and terrorists, saying that Moscow was undertaking efforts to establish a practical collaboration with key regional and international partners.


"We were able to establish business contacts with Middle Eastern governments and we are in negotiations with Saudi Arabia Jordan Staal Hurricanes Jersey , the United Arab Emirates, Egypt, Jordan, Israel Noah Hanifin Hurricanes Jersey , and other countries, and are attempting to establish interactions with the United States and Turkey," he said.


The Russian air force has been launching strikes in Syria since Sept. 30 following a request of Syrian President Bashar al-Assad.


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