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Kent Cigarettes and the technological evolution of filters The Future of Kent Cigarettes Brand History By 2030, Kent plans: Plant-based filters AI-optimized nicotine delivery Carbon-neutral production Conclusion: Kent Heritage as Tobacco Innovation Pioneer From its 1952 origin of Kent with the first filter cigarette to its enduring Kent heritage, Kent Cigarettes defined the post-war tobacco era

An ASTM level 3 is the highest, identifying greater than 98% bacterial filtration efficiency, sub-micron particulate filtration and is ideal in situations "in which there is a high risk of fluid exposure," according to ASTM International

One of the first questions could be do you actually need one

Retrieved May 10, 2009

This will benefit your indoor air as it will your green plants, too