Phenomenon window

Can You Trust Your DIY Air Monitor?

You've seen the headlines about air quality, and maybe you've even thought about building your own sensor to check the air around you. But here's the thing: how do you know if that DIY gadget is actually telling the truth? Imagine getting a health alert from a device you built yourself—would you trust it enough to change your plans? This project is all about putting your creation to the test. You'll build a low-cost PM2.5 sensor, then compare its readings to the official EPA monitors in your area. Are they close, or way off? You'll dig into the data, see where your sensor shines, and where it might lead you astray. By the end, you'll know if your DIY monitor is a reliable tool for keeping you and your community safe, or just a cool science experiment.

• “

  Have you ever checked an air quality app or website before heading outside? What did you do with that information?

• “

  Have you ever used a device or app that gave you data you weren't sure you could trust? How did you decide whether to believe it?

• “

  If you built your own air quality monitor and it showed a high pollution level, would you change your plans? Why or why not?