Real Simple has put together a handy guide to what’s polluting the air we breathe, and where we can go to get answers about air quality (in the U.S.). Check it out.

Here’s the scary lowdown on formaldehyde, for example: Used in permanent-press fabrics, paint, and the glue that binds plywood and particleboard, formaldehyde causes airway irritation, headaches, dizziness, and nausea and has been linked to asthma and some forms of cancer.

Yikes.

Photo credit: Environmental Health Houston