5月31日,在美國加利福尼亞州洛杉磯,遊客在瞭望平臺觀望被霧霾籠罩的城市。新華社/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,在美國加利福尼亞州洛杉磯,遊客在瞭望平臺觀望被霧霾籠罩的城市。新華社/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