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Young woman looking out to sea from boat dock.

Source: Gary John Norman / Getty

Much like Sunday, Monday will be extremely uncomfortable. The National Weather Service has issued a heat advisory for most of the D.C. region from noon to 8 p.m. Monday. The heat index could be up to 109 degrees. Air quality is a Code Orange. which means the pollution levels are unhealthy to children, older adults and folks with respiratory or heart conditions.

source:  WTOP.com