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Oftentimes, manufacturers will also list the size of particulate matter that an air purifier can defend against, sometimes listed as a PM value

The study, which was published in Environmental Science & Technology , found that the thermal decomposition of propylene glycol and glycerin, two solvents found in most e-liquids (the substance that is vaporized by the e-cigarette), leads to emissions of toxic chemicals such as acrolein and formaldehyde

Nature Med

This is because a more powerful air purifier will more easily and quickly neutralize smoke, especially in a small room

Poor-quality candles tend to burn less efficiently, which results in more soot being produced