空气净化器选购指南

We test portable air purifiers for a range of room sizes. For every room size, we have found models that are capable of quickly clearing dust, smoke, and pollen at both their high and low speeds. What to Look For What to Skip ADVICE reusable—prefilter collects large particles before they reach the HEPA filter, possibly extending its life. ■ Most portable air purifiers use a fan to suck in particle- rich air for filtration. Fanless models are quieter, but those we tested worked poorly. ■ Models with electrostatic precipitators or ionizer technology could produce ozone, a lung irritant. Many models are certified for a clean-air delivery rate (CADR), their cleaning speed. …