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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.

BEIJING, Feb. 2, (Xinhua) -- All Chinese travelers stranded in Egypt are expected to have been returned to China by Thursday, the start of the Spring Festival, said China's national tourism authorities late Wednesday.As of the Spring Festival Eve, most of the Chinese tourists stranded in Egypt due to the country's nation-wide protests had been flown back to China by chartered planes, according to a statement released by the National Holiday Office, an inter-ministerial agency led by the National Tourism Administration.China had sent a total of eight "special commercial flights" to Cairo, Luxor and Hurghada to bring back Chinese citizens stranded in these cities, and six of the planes had returned, carrying 1,371 people, including those from Hong Kong, according to the Chinese Foreign Ministry.The Spring Festival is the Chinese lunar New Year, a time for family reunions, according to Chinese tradition.The National Holiday Office has also issued warnings about traveling to Australia, as tropical cyclone Yasi was expected to make landfall in northeast Queensland late Wednesday local time.

SANAA, Feb. 5 (Xinhua) -- The Somali pirates hijacked a Chinese-flagged commercial ship off Yemen's western city port of al- Hudaida in the Red Sea, Chinese military attache to Yemen confirmed to Xinhua on Saturday.The Chinese military confirmed that the Chinese-flagged commercial ship, which was registered in Hongkong, China, had been hijacked by the Somali pirates off the Yemeni coast, Chinese military attache to Yemen told Xinhua.The ship was then moved by the pirates towards the Somali coasts, he added, without providing how many people were on board or the date of the hijack.Earlier, Yemeni Interior Ministry said the Chinese ship called "Tien Hau" was attacked by the pirates some 11 nautical miles (20. 4 kilometers) off the Yemeni island of Al-Tair off the city port of al-Hudaida.Meanwhile, a security source at the ministry told Xinhua "the security operation room of the ministry received unconfirmed information that an anti-piracy international navy fleet might intercept the pirates and help release the Chinese ship.""We are following up the situation to confirm the release of the Chinese ship, as coast guard boats were dispatched to track the ship and pirates," he told Xinhua on condition of anonymity."The hijack took place early today, but we do not have exact information about the number of the ship's crew," he added.The Gulf of Aden is considered as one of the world's most dangerous waters because of rampant piracy.

BEIJING, March 28 (Xinhuanet) -- Google Inc. is working with MasterCard Inc. and Citigroup Inc to develop a technology that could make mobile payments, according to media reports Monday.The new technology named "Nexus S Android" is embedded in Android mobile devices and allows customers to make purchases by waving their smartphones in front of a small reader at the checkout counter.Credit-card reader producer VeriFone Systems Inc, also involved in the new payment service, is developing contact-less devices that could allow people to pay with a wave or tap of credit card or a tap of smartphone.To use the service, holders of Citigroup-issued debit and credit cards must activate a mobile-payment application developed for one current model of Android phones. More models will be coming as the technology advances.Besides mobile payment, consumers would also be able to get targeted ads or discount offers, manage credit-card accounts and track spending through an application on their smartphones.Due to the deliberate design of the technology, customers have no need to worry about the security of their payment information. Nick Holland, a mobile-transactions analyst at Yankee Group, said the new technology is more sophisticated than credit cards with a magnetic stripe.With the coming service, Google is aiming to boost its advertising business by offering retailers more data about their customers and help them target ads and discount offers to mobile-device users near their stores.An insider told that Google was not expected to get a cut of the transaction fees.The service is expected to be released this year. Once released, it will broaden the uses of smartphones for everyday activities—from chatting to emailing to shopping.