Masks are now recommended indoors and on public transportation in nine New Jersey counties, after coronavirus levels increased in Salem County, the Center For Disease Control and Prevention said on Thursday. Atlantic, Burlington, Camden, Cape May, Gloucester, Monmouth, Morris, Ocean, Salem and Sussex counties are considered “high” community levels of the virus, the CDC says. Cumberland County is the only level with low counties; the others are all considered “medium.” Just five weeks ago, all New Jersey counties were considered areas of low community levels. But virus levels have increased sha…