5月31日,美国加利福尼亚州洛杉矶被雾霾笼罩。新华社/法新
A view of the Los Angeles city skyline as heavy smog shrouds the city in California on May 31, 2015. AFP PHOTO/ MARK RALSTON
5月31日,美国加利福尼亚州洛杉矶被雾霾笼罩。新华社/法新
A view of the Los Angeles city skyline as heavy smog shrouds the city in California on May 31, 2015. AFP PHOTO/ MARK RALSTON