The Allegheny County Health Department advises the watch will last through Monday, after forecasts showed fine-particulate matter (PM2.5) levels in the area exceeding the 24-hour standard.

Young children, the elderly and people with respiratory problems like asthma, emphysema and bronchitis are encouraged to limit their time outdoors.

“Companies most significantly contributing to particulate pollution will be ensuring equipment is functioning properly and they have sufficient staff and resources available to expeditiously implement the warning phase of their mitigation plans,” the ACHD says.

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