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RIO DE JANEIRO, Sept. 26 (Xinhua) -- Rio de Janeiro has the highest level of air pollution in Brazil, and is more polluted than many other world metropolis like New York, London and Paris, a World Health Organization (WHO) study said Monday.According to the study, which was carried out in 91 countries and regions, the air in Rio's metropolitan area contains 64 micrograms of fine particulate matter per cubic meter, over three times the upper limit set by the WHO, which is 20 micrograms per cubic meter.Despite being larger, having a bigger population and more vehicles, Sao Paulo's metropolitan area has less air pollution, with 38 micrograms of fine particulate matter per cubic meter.According to the WHO, "the largest contributors to urban outdoor air pollution include motor transport, small-scale manufacturers and other industries, burning of biomass and coal for cooking and heating, as well as coal-fired power plants." The organization said that residential wood and coal burning for heating also help increase air pollution, especially in rural areas in the cold months.The WHO expressed concern over air pollution levels in several cities, as some two million people worldwide die annually from conditions resulting from air pollution."Air pollution is a major environmental health issue, and it is vital that we increase efforts to reduce the health burden it creates," said Dr. Maria Neira, WHO's director for Public Health and Environment.According to the study, Ahwaz, Iran, has the most polluted air in the world, with 372 micrograms of fine particulate matter per cubic meter.

BEIJING, Aug. 14 (Xinhua) -- China's National Energy Administration (NEA) announced Sunday that the country's total electric power consumption rose 12.2 percent from a year earlier to 2.69 trillion kilowatt-hours (kwh) during the first seven months of this year.In July alone, power consumption was up 11.8 percent year-on-year to 434.9 billion kwh, according to the NEA.During the first seven months, power consumption in the country's primary industries rose 5.1 percent year-on-year to reach 59.1 billion kwh; power use in secondary industries totaled 2.0253 trillion kwh, up 11.9 percent; consumption in tertiary industries surged 15.5 percent to reach 285.3 billion kwh.Meanwhile, consumption by residents in both urban and rural areas rose 12 percent to 317.2 billion kwh.Power generated by China's newly-built power plants reached 41.23 million kilowatts during the January-July period, of which 7.69 million kilowatts was hydro-generated and 27.74 million was coal-fire generated.

BEIJING, Aug. 22 (Xinhuanet) -- Researchers have discovered how a human egg captures an incoming sperm for fertilization, paving the way to help couples suffering from infertility, according to media reports on Monday.An international team of researchers found that a sugar chain known as the sialyl-lewis-x sequence (SLeX) makes the outer coat of the egg “sticky,” which has proven to be helpful in binding the egg and the sperm.As a result, this observation has filled in a huge gap in the understanding of fertility and provides hope for ultimately helping couples who currently cannot conceive.Scientists and doctors know that a sperm identifies an egg when proteins on the head of the sperm match and bind to a series of specific sugars in the egg’s outer coating. With a successful match of proteins, the outside surfaces of the sperm and egg then bind together before merging, which is then followed by delivery of sperm’s DNA into egg.To identify this molecules, the researchers used ultra-sensitive mass-spectrometric imaging technology to observe and identify which molecules are most likely to be key in the binding process.They experimented with a range of synthesised sugars in the laboratory and found that it is SLeX that specifically binds sperm to an egg.According to the World Health Organisation, infertility affects about 15 percent of reproductive-aged couples around the world and almost one in every seven couples in Britain has problems conceiving a child for various reasons.

BEIJING, Aug. 26 (Xinhua) -- China's maritime authority on Friday once again urged U.S. oil giant ConocoPhillips to finish cleaning up oil spills in north China's Bohai Bay as soon as possible.Aug. 31 is the deadline set by the government. "There are only five days to go before the arrival of the deadline," said a statement of the State Oceanic Administration (SOA).The SOA urged ConocoPhillips China to adopt all technical measures that could be used to clean up oil spills, and to do it "with an active manner."Liu Cigui, head of the SOA, said Thursday that his administration is collecting evidence and gauging the ecological impact of the spills in preparation for possible legal action against the company.ConocoPhillips China, a subsidiary of ConocoPhillips, first reported the oil spills in June. The spills have spread to beaches in Hebei and Liaoning provinces and been blamed for losses in local tourism and aquatic farming industries.Although the company has worked to clean up the spills, pollutants have still been found in the bay, even after cleanup efforts were reported to be complete.ConocoPhillips China admitted that a total of 16 oil spill sources have been found in the bay as of Friday.

BEIJING, July 17 (Xinhua) -- Iraqi Prime Minister Nouri al-Maliki arrived in Beijing Sunday night for his first official visit to China as a guest of his Chinese counterpart Wen Jiabao.During al-Maliki's stay in China from Sunday to Thursday, President Hu Jintao will meet with him, and Premier Wen will hold talks with the Iraqi prime minister, Chinese Foreign Ministry spokesman Hong Lei said earlier.China and Iraq share a traditional friendship, Hong said, adding that the two countries have witnessed smooth development of bilateral relations, steadily growing economic cooperation and increasing cultural exchanges."China is ready to work with the international community and to continue to provide assistance for the Iraqi people to improve their livelihoods," said the spokesman.

来源：资阳报