It became so dense, at times, that it was challenging for residents to find their way around at night, according to the U.K.

LONDON – Thick fog has caused numerous flight delays and cancellations at London Heathrow and other area airports. Travelers were advised Monday to check their flight status before going to the ...

Here on the East Coast, we’re already experiencing the first whispers of fall. It’s getting cloudier, rainier and drearier in the best possible way. For those who struggled to endure the hottest, ...

The Great Smog, which blanketed London for five days in December 1952, is estimated by some experts to have killed more than 12,000 people and hospitalized 150,000. Thousands of animals also died.