I am working with a client that  has multiple locations across the nation, and they recently merged all of the location sites into one site. To allow the lead capture forms to pre-populate the locations, they are using the query string  /?location=cityname on every page. EXAMPLE - www.example.com/product www.example.com/product/?location=nashville www.example.com/product/?location=chicago There are thirty locations across the nation, so, every page x 30 is being flagged as duplicate content... at least in the crawl through MOZ. Does using that query string actually cause a duplicate content problem?