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LOS ANGELES, April 27 (Xinhua) -- Air pollution poses a threat to the health of about 154 million Americans -- or more than half of the U.S. population, the American Lung Association (ALA) said on Wednesday.The air is so polluted in some areas that it is often dangerous to breathe, the ALA said in its annual report on air quality across the United States.About 48 percent of U.S. residents live in counties where smog (ozone) is too high, 20 percent live in areas where there are too many short-term spikes in pollution and six percent live in areas with harmful year-round soot (particle pollution), said the report.About 17 million Americans live in areas afflicted by all three air pollution hazards, the report noted.The report listed California as the most polluted state, where people are breathing some of the worst air.Compared with other states, California has more polluted places, including Los Angeles, Long Beach, Riverside, Bakersfield and Fresno, the report said.Honolulu in Hawaii and Santa Fe-Espanola in New Mexico are the only two cities in the nation that had no days in which smog and soot levels reached unhealthy ranges, making them the cleanest cities in the nation, said the report.Research suggests air pollution threatens human health -- and not just the lungs.Small particles of pollution can lodge deep in the lungs, triggering an inflammatory process that, over time, can spread elsewhere in the body and damage blood vessels and the heart, according to Dr. Norman Edelman, the ALA's chief medical officer.On days in which smog levels spike, there's an increase in hospital admissions for respiratory illnesses, heart attacks and stroke in the two or three days following it, said Michael Jerrett, a professor of environmental health sciences at University of California, Berkeley's School of Public Health.In addition to posing both long-term and short-term risks, pollution can also contribute to low birth weights, diabetes, cardiovascular disease, heart attack, stroke and, ultimately, shorter life spans, he warned.

BAIKONUR, Kazakhstan, April 5 (Xinhua) -- Russia launched a spacecraft with three astronauts on board from the Kazakh Baikonur space center early on Tuesday, Xinhua correspondents reported from the site.The Soyuz TMA-21 spacecraft atop a Soyuz-FG carrier rocket blasted off at 02:18 a.m. Moscow time (2218 GMT April 4), sending to the International Space Station (ISS) Russian cosmonauts Alexander Samokutyaev and Andrei Borisenko and U.S. astronaut Ronald Garn.The Russian Soyuz TMA-21 spacecraft, named after the first cosmonaut Yuri Gagarin, carrying the International Space Station (ISS) crew of U.S. astronaut Ronald Garan, Russian cosmonauts Alexandr Samokutyaev and Andrey Borisenko, blasts off at the Baikonur cosmodrome, April 5, 2011.The Soyuz TMA-21, named after the first cosmonaut Yuri Gagarin, was scheduled to dock with the ISS at 03:18 a.m. Moscow time (2318 GMT April 6) on Thursday.According to the Russian Federal Space Agency (Roscosmos), the three new crew members are expected to spend 170 days in the ISS. During the period, they will receive two U.S. space shuttles and three Russian Progress cargo ships, conduct a spacewalk and carry out over 40 experiments.The launch is dedicated to the 50th anniversary of the first flight into space in 1961 carried out by Gagarin.

BEIJING, Feb. 24 (Xinhua) -- Chinese Premier Wen Jiabao attended the opening ceremony of the China-EU Year of Youth in Beijing on Wednesday, encouraging young people from China and the EU to build a brighter future for bilateral strategic partnerships.Joining over 500 young people from China and the EU in the Capital Museum in downtown Beijing, Wen said that the year-long youth exchange campaign was the first theme year between China and the EU since the establishment of diplomatic ties, and is also the largest-ever China-EU cultural exchange program."This has revealed that our relations will be more vibrant in the future and full of hopes," he added.China and the EU are in a vital period for deepening cooperation, Wen said, calling on young people from both sides to consider and explore ways to share opportunities, meet challenges and seek common development, which has benefits for China, the EU and the world.Wen hopes that young people from both sides would always be brave in pursuing innovation and the truth. He also encouraged them to learn from each other in a frank and open spirit, in a bid to jointly create a better future for China-EU ties.A video speech from European Commission President Jose Manuel Barosso was aired at the ceremony. He said that the Year of Youth offers an interactive platform for European and Chinese young people to enhance mutual understanding and friendship and also inject vitality to China-EU relations.Premier Wen and Barroso jointly initiated The China-EU Year of Youth during the 12th EU-China summit held in 2009.Along with the opening ceremony in Beijing, Chinese and European youth were immersed in two-day discussions on topics such as culture, education, volunteering, creativity and environmental protection starting on Tuesday."We had excellent discussions on possible cooperation projects, ranging from environmental protection, world heritage to art and intellectual property," said Pierre Arlaud, a member of an EU youth delegation that arrived in Beijing on Monday to participate in the opening ceremony."I can feel there is a strong will from both sides to deepen understanding and forge a stronger partnership," he added.The opening ceremony was the first in a series of exchange activities that will be held throughout the year in China and Europe. The events include cultural seminars, volunteer service conferences, youth summer camps and TV debates.The year-long program was co-hosted by the All-China Youth Federation and the European Commission. The initiative aims to promote intercultural dialogue and strengthen mutual understanding and friendship between young people in China and the EU, as well as encouraging them to support the development of China-EU relations.

来源：资阳报