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2018;141(4):e20173557

Several factors determine how quickly your filter will clog: Outdoor air quality: Areas with high pollution, wildfire smoke, or construction dust will dirty filters faster Pet hair and dander: Dogs and cats shed constantly, and their fur quickly clogs filter fibers Indoor smoking: Cigarette smoke creates a sticky residue that coats filters rapidly Daily HVAC use: Systems that run frequently during extreme weather will process more air and collect more debris Low-quality filters: Thin fiberglass filters offer minimal surface area and fill up quickly High-MERV filters: While these catch more particles, they also clog faster and need more frequent replacement Filter replacement frequency depends on your specific filter type and home conditions: Fiberglass filters: Replace every 30 days

The overall score is an average of the four component scores

Retrieved from Lee, W.H

The reason 20 became the standard is practical

In the meantime, local and state level protections including prioritizing tobacco program spending in existing budgets, higher tobacco excise taxes on tobacco products, stronger local tobacco policies supporting smoke-free environments, and restrictions on the sale of flavored tobacco products are needed to address long-existing inequities in smoking rates and health outcomes in our country