This is the simpler of the two questions. A safe level of radon gas is no radon gas. Radon gas is a carcinogen which causes lung cancer. The US EPA has put it plainly, stating, Any radon exposure has some risk of causing lung cancer.The lower the radon level in your home, the lower your family's risk of lung cancer..hile no level of radon gas is completely safe, as with most things in life we must balance the benefits and costs to find our own acceptable levels. We walk outside and work in the sun, exposing ourselves to ultraviolet radiation and increasing our risk of developing skin cancer.
Photo courtesy of the DC SHPO. The Old Stone House, located at 3051 M Street in Georgetown, was built in 1765, making it the oldest standing building in Washington, DC. The exterior of the house is constructed of locally quarried blue granite.
135 pages on this wiki. The Brownstone is a house located in New York City at 42 Stanford Avenue, Brooklyn, New York, 11209. It is owned by Sherlock Holmes' father, and is home to Sherlock and Joan Watson, although Joan is only living there until she can find another suitable apartment. Although the brownstone is in Brooklyn on the show, the outside of the building is shot in Harlem, New York City, with interiors shot at Silvercup Studios in Queens. 2  The roof is a real rooftop in New York City and is located at the corner of 10th St & 44th Av.