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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There seems to be a difference between ionic air purifiers and ozone generators (https://en.wikipedia.org/wiki/Air_ioniser). Are you not exaggerating saying that all ionic air purifiers release ozone?
I have a panasonic nanoe-G Air purifying air conditioner in my apartment and as far as I can find information online, it does not release ozone, does it?


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


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.