merv

This Old House's Ross Trethewey explains MERV filter ratings and how air filtration works, then shows how to build a localized DIY air filter, including a box fan with multiple filters.

A University of Michigan Medicine demonstration of building a cheap DIY air purifier from a box fan and a HEPA or high-MERV filter using hardware-store parts. It explains why this helps against dust, smoke and viruses and ties it to local air quality readings.

Associated Press footage of masked federal agents detaining Tufts student Rumeysa Ozturk on a street in Somerville, Massachusetts. Her lawyer filed an emergency motion seeking her release.