Assertion: great smog | /r/HasProperty | severe air-pollution event
Facets:
Source sentences:
text: The Great Smog of London, or Great Smog of 1952, was a severe air-pollution event that affected the British capital of London in early December 1952.
text: The Great Smog of London, or Great Smog of 1952, was a severe air-pollution event that affected the British capital of London in early December 1952.