A couple takes photos in front of a fence covered by "love padlocks" on a hazy day at "N Seoul Tower" located atop Mt. Namsan in central Seoul on February 27. High-level fine dust and smog continued to pollute the air of Seoul and its metropolitan region on Thursday. Seoul city authorities asked that residents refrain from doing outdoor activities due to the worsening air quality, according to local media. "N Seoul Tower" is a scenic spot, popular among young couples, where they can hang padlocks and throw away the keys to symbolise their everlasting love for each other. Reuters/Kim Hong-Ji