In 2004, Dina Cappiello discovered some Houston residents were exposed to cancer-causing toxins at a level 20 times higher than federal guidelines — for toxic waste dumps. “Everybody was like ‘nothing to see here,’ but I was like something doesn’t add up,” Cappiello said. In this guide, we share tips and examples from Cappiello and other reporters of what you can request in your community to understand how dangerous the air is and even pinpoint potential polluters.
