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Some well-known brands that have never made our cut include Alen, Bissell, IQAir, Rabbit Air, and TruSens

(SOUNDBITE OF ARCHIVED RECORDING) BROWN: And we can see how many of these billboards were in our neighborhood

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However, the high price ($1,399) kept the air purifier out of the top spot or the runner-up spot since it may not be cost-effective for the average consumer

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is a prominent US-based multinational tobacco company that manufactures and supplies various smoke-free and nicotine-containing electronic gadgets and vapor accessories