Air Quality Blog
Guides, news, and tips to help you understand air quality and protect your health.
How to Use the Air Quality Index to Protect Yourself
The AQI number is only useful if you know what to do with it. Here's exactly how to act on it — whether the air is a little off or genuinely dangerous.
What Is the Air Quality Index (AQI)? A Complete Guide
The AQI is a standardized scale from 0 to 500 that tells you how clean or polluted your air is. Learn how it's calculated, what the categories mean, and how to protect your health.
How Wildfire Smoke Affects Air Quality — and What to Do
Wildfire smoke can travel hundreds of miles and send AQI readings into hazardous territory overnight. Here's how to stay safe when smoke rolls in.
10 Ways to Improve Indoor Air Quality at Home
Indoor air can be 2–5x more polluted than outdoor air. These practical steps can dramatically improve the air you breathe inside your home.
PM2.5: Why These Tiny Particles Are a Big Health Threat
Fine particulate matter smaller than 2.5 microns can penetrate deep into the lungs and enter the bloodstream. Learn what PM2.5 is and how to reduce your exposure.
US Cities With the Best Air Quality in 2026
Using EPA annual data, we ranked every major US city by air quality. These are the cleanest places to breathe in America right now.
HEPA vs. True HEPA: What's the Difference?
Not all HEPA filters are created equal. Learn the difference between standard HEPA, True HEPA, and HEPA-type filters — and why it matters for your health.
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