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The very young, very old and those with respiratory conditions should limit their time outside in the Mon Valley Tuesday and Wednesday.
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Air quality for the Liberty-Clairton area prompted a Code Red warning Tuesday morning — a level the Pennsylvania Department of Environmental Protection deems to be unhealthy for all people. The flare-up followed three consecutive days of DEP-issued Code Orange alerts warning of unhealthy pollution levels for sensitive groups of people.
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Twenty Pennsylvania counties are under a state-imposed Code Orange Air Quality alert, including Allegheny, Beaver, Westmoreland and Washington counties.…