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A Code Orange Air Quality Alert is in effect Friday for York County, according to the National Weather Service.

The alert, which is also for Dauphin, Lebanon, Cumberland and Lancaster counties, means that air pollution concentrations within the region may become unhealthy for sensitive groups, including children, elderly, and people suffering from asthma, heart disease or other lung diseases.

The NWS advises these groups to avoid strenuous activities or exercise outdoors during air quality alerts.

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