The Fog is a Manga/Manhwa/Manhua in english language, Mystery series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

A desolate town thought a new chemical facility would bring economic revival but instead chaos breaks loose after a gas leak. It causes a mysterious and toxic fog to consume the town, leaving behind a trail of death and mutation. The fearful townspeople begin their fight to survive while the government tries to hide the truth behind the event.