Bloomberg: (Clarifies nature of pollutions threat to health and welfare.) Air pollution in China is becoming a serious political concern for the countrys leaders. It is by far the biggest environmental issue in China, attracting considerably more public anger than does climate change. That should come as no surprise, since air pollution has killed millions there. As a result, China is embarking on a debate about controlling pollution, comparable to what the U.S. and Europe went through 30 years agoa journey...