Discusses general air cleaning filters and devices, including a small section near the end on ductless range hoods; from the California Air Resources Board.

Consumer-generated reviews, buying tips and advice, ratings, price information, and searchable in a variety of ways from price to product type.

Lists major manufacturers, product lines, experts, and some how-to and consumer advice, so that consumers can see what is on the market. Does not accept payments for listings.

Column with two Q&As, the second one deals with ductless range hoods being up to code.