9 of the best air purifiers to deal with pets, pollen, and pollution

We know taking deep breaths is calming and all, and we don't want to freak you out — but those big gulps of untreated air can contain a lot of harmful contaminants and irritants.

For one thing, pollen season is getting worse every year. (If your allergies seem more annoying than usual lately, it's not your imagination.) A...