Gaze out the windows of John Marshall Junior High in Seattle and you will see cars and trucks whizzing by on the busiest freeway in the state, Interstate 5. John Marshall is one of 28 public schools and more than 125 day cares that InvestigateWest has found built within 500 feet of Washington's highest-traffic roadways. That's close enough to put children's health at risk, say health researchers. For “Exhausted at School,” InvestigateWest combined data from multiple state agencies and pored over dozens of academic studies to understand the threat of toxic pollution and its effect on kids' health at school. Our reporting immediately spurred Seattle Schools officials to action: they added a new policy to issue air quality alerts to principals, and announced plans to upgrade a decades-old ventilation system at John Marshall. Officials in Olympia and Washington, D.C., considered and then rejected the notion of banning or severely restricting construction of schools inside the pollution plume, according to interviews and records obtained by InvestigateWest. Meanwhile, state officials do not enforce rules requiring day cares to be built on environmentally safe sites. So schools and day cares continue to be built in the danger zone around freeways, and children pay the price - years after the dangers were conclusively proven. “Exhausted at School” is a collaboration between InvestigateWest and KING 5 Television.