Have you ever wondered what’s really in the air you breathe? From invisible pollutants to subtle environmental shifts, the quality of our air impacts everything from our health to our productivity.

If you're someone who needs to (or likes to) take their work on the go, a portable monitor will make a huge difference. These are my favorite that I tested.

CNET staff -- not advertisers, partners or business interests -- determine how we review products and services. If you buy through our links, we may earn a commission. Portable monitors are a simple ...