Karen Cady-Pereira

Karen Cady-Pereira, senior staff scientist and manager for radiation and climate with Atmospheric and ­Environmental Research, a Lexington, Massachusetts, weather-and-climate-consulting company. She was lead author of a study of megacity air quality published in Atmospheric Chemistry and Physics. AER.com

Destinations

Great Travel Destinations with Terrible Air Quality

Here are some of the most popular tourist destinations that could fill your lungs with dangerous air pollution.