article_snippet.sent: mud, covering people in the northern city of Aershan in a strange dark residue, according to the People's Daily Online.
article_snippet.sent: But photos of people's hands covered in the black soot have circulated widely online and many Aershan citizens are concerned over the possible health issues.
article_snippet.sent: Muddy: Red sky came with a light misty drizzle which was mixed with a strange black mud-like residue .
highlights_snippet.sent: Mud-like residue after the storm causes health concern with many citizens .
  