These 10 cities had the highest levels of year-round pollution, according to the American Lung Association.
|Katie Couric takes responsibility for "misleading" part of gun violence doc|
|Zurich Insurance's ex-CEO Martin Senn commits suicide|
|'X-Men' takes top spot as 'Alice' flops at Memorial Day box office|
|The company behind 'American Idol' has filed for bankruptcy April 29|
|Striking Verizon workers score raise and bonuses|