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That said, filters will last for up to four years, so this helps reduce yearly maintenance costs

Its worth noting that even with the five-year filter lifespan, it doesnt quite pay for itself compared to a similarly powerful air purifier that requires annual or biannual filter changes, such as the Levoit or the smaller Blueair models

Justin Helton is a commerce editor at Road & Track and an enthusiast with a passion for heavily depreciated autos and a penchant for philosophical debate

Experts who study human behaviour and how people change habits agree that punitive approaches to instituting change do not work for issues such as littering