Increasing concerns about air quality, whether from seasonal smog, wildfire smoke, or urban pollution, have made effective respiratory protection a priority for many people in the U.S. — especially for professionals on the go, students, commuters, and anyone spending time outdoors in cities like New York, Los Angeles, Chicago, and Seattle. But with so many mask types on the market, how do you know which ones actually work? This guide breaks down what scientists and health experts recommend — and more importantly, what you might want to avoid. How Masks Help Protect Your Lungs Air pollution consists of tiny particles and gases that can penetrate deep into your respiratory system. The most harmful of these particles, often referred to as PM2.5 , are less than 2.5 micrometers in diameter — small enough to reach the lungs and enter the bloodstream. Masks with strong filtration can help reduce inhalation of these fine particles, making them a useful tool when air quality worsens...
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