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Ambient air pollution affects urban and rural areas. Major sources include inefficient energy use in households, industry, the agriculture and transport sectors, and coal-fired power plants. In some areas, sand and desert dust, waste burning and deforestation are additional sources of air pollution. Air quality can also be influenced by natural elements such as geographical, meteorological and seasonal factors.
Amazon’s?patent,?approved last month,?could lead to the?development of noise-canceling headphones?that could?be overridden and muted by certain noises or keywords. This could mean the headphones are always listening for something that could indicate danger, like a car horn or emergency vehicle siren. It also means users could program in their own override words, phrases and sounds, such as the user’s name.
Among Beijing’s districts, Chaoyang is home to the most permanent residents with 3.74 million, followed by Haidian with 3.48 million. Chaoyang and Haidian are also home to the largest number of migrant residents, with a combined total close to three million, accounting for almost 40 percent of Beijing's total.
Amazon’s timetable for same-day delivery. (Amazon Photo)
Amazon’s growth has created “a lot of challenges, and I spend a lot of my time on the challenges,” said Seattle?City Councilmember Mike O’Brien. “But it’s important to remind myself that the absence of Amazon would provide a whole host of challenges that I’m not prepared to deal with. The net [effect] is a good thing.”
来源：资阳报