More than 1 million residents of the Washington-Baltimore region already live close to heavily trafficked motorways where dangerous soot pollution is at levels that can trigger asthma attacks, heart attacks and respiratory disease. Building the $2.4 billion (and rising), 18-mile intercounty connector linking Interstate 270 to Interstate 95 through neighborhoods and near schools would worsen these health problems. Maryland Gov.-elect Martin O'Malley (D) reiterated his support for the road following his election last month, but if the public demands protection for our children and the elderly, he still could take steps to prevent these health hazards. The toxic pollution the...