The National Weather Service has issued a heat advisory for Indiana, Jefferson, Armstrong and the southwest corner of Westmoreland County from 11:00 Sunday morning to 8:00 Wednesday night, but that has triggered another advisory by the Pennsylvania Department of Environmental Protection.
A Code Orange Air Quality Action Day has been declared for tomorrow for a part of the Southwest Pennsylvania Region, including Westmoreland and Armstrong County, and will expand into Indiana County on Monday. On Sunday, sunny skies, light southwest winds, highs in the 90s and limited vertical mixing will produce significant ozone concentrations. Those conditions are expected to continue into Monday.
Ozone forms when airborn chemicals like nitrogen oxides and volatile organic compounds react with sunlight. On a Code Orange day, young children, the elderly, and those with respritory problems like asthma, bronchitis and other conditions, are especially vulnerable to the adverse effects of higher Ozone concentrations and should limit outdoor activity on those days. Others are asked to reduce ozone pollution by driving less or carpooling, reduce vehicle trips by combining errands, limiting engine idling, refueling cars after dusk, and conserving electricity.
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