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Similar content being viewed by others Background Air pollution and its health hazards have been an important issue for researchers for decades

If you can, place a fan inside the window, with the fan turned inwards

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Exception: An exception exists for some lighters, like empty Zippos or up to two fueled lighters if they are secured in a DOT-approved case, which prevents leaks and activation

Further reading How to DIY an Air Purifier by Tim Heffernan If your air quality is bad and you dont have an air purifier, an HVAC filter taped to a box fan is better than nothing