Donora Borough officials have made sure the infamous day in Donora's history that led to national air quality reform will not soon be forgotten.

Between Oct. 26 and 31, 1948, a blanket of dense, cold valley air above Donora kept smoke from the zinc plant from escaping the community.

As the days passed, the borough became shrouded in toxic smog.

Pollution from the event caused the deaths of 20 people and more than 7,000 were hospitalized or became ill.

The national impact became evident in 1949, when Pennsylvania lawmakers formed the Division of Air Pollution Control to study the disaster.

The ...

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