What are ionizers and do they work?

ओह! यह पोस्ट हिन्दी में उपलब्ध नही हैं।अंग्रेजी संस्करण के हेतु यहाँ क्लिक करे l

 

The Sqair air purifier Kickstarter

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Chris

I read that HEPA filters cannot capture PM 2.5, is this right?

Rollie

I am looking for a reasonably accurate and priced PM2.5 tester for use at a small school and my home. Under $200?? can you help. There are many out there.