Sign of air pollution

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Possible Answers:

Smog.

Last seen on: Daily Celebrity Crossword – 2/4/19 Movie Monday

Random information on the term “Smog”:

The 1948 Donora smog was a historic air inversion that resulted in a wall of smog that killed 20 people and caused respiratory problems for 6,000 people of the 14,000 population of Donora, Pennsylvania,[2] a mill town on the Monongahela River 24 miles (39 km) southeast of Pittsburgh. The event is commemorated by the Donora Smog Museum.

Sixty years later, the incident was described by The New York Times as “one of the worst air pollution disasters in the nation’s history”.[3] Even 10 years after the incident, mortality rates in Donora were significantly higher than those in other communities nearby.[4]

The fog started building up in Donora on October 27, 1948. By the following day it was causing coughing and other signs of respiratory distress for many residents of the community in the Monongahela River valley. Many of the illnesses and deaths were initially attributed to asthma. The smog continued until it rained on October 31, by which time 20 residents of Donora had died and approximately one third to one half of the town’s population of 14,000 residents had been sickened. Another 50 residents died of respiratory causes within a month after the incident; notable among the fatalities was Lukasz Musial, the father of future baseball Hall of Famer Stan Musial, the 1948 National League MVP.

Smog on Wikipedia