5月31日,在美国加利福尼亚州洛杉矶,游客在瞭望平台观望被雾霾笼罩的城市。新华社/法新
Tourists at the Griffith Observatory observation deck look out at 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,在美国加利福尼亚州洛杉矶,游客在瞭望平台观望被雾霾笼罩的城市。新华社/法新
Tourists at the Griffith Observatory observation deck look out at the Los Angeles city skyline as heavy smog shrouds the city in California on May 31, 2015. AFP PHOTO/ MARK RALSTON