How can I make the air in my office more breathable? HEPA filter, activated charcoal, or both? Brand/model recommendations?

HEPA filter is a great way to go, removes 99.97% of particulate matter. It's great if you have allergies and/or pets. Many HEPA filters also come with an activated carbon pre-filter.

There are several good models out there, but I'd personally recommend the Honeywell 50250.

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