When they arrived in Longboat Key this February, Carol Leone and her family were excited for two weeks of relaxation in the salty breeze. Within days, they started to cough. Soon, Leone’s voice ...

Say the word pollution, and what comes to mind? Plumes of smoke rising from smokestacks? A brown haze over the city? Oily streaks of colored swirls on the surface of streams and rivers? Trash on the ...