Posted on August 30th, 2021 by Phill Snel Prof. Jeffrey Siegel | What are HEPA filters and how effective are they in Ontario classrooms? August 27, 2021 | Toronto.com
Posted on May 27th, 2021 by Phill Snel Prof. Jeffrey Siegel | Caution to the Wind: Desperate to reopen and loaded with stimulus cash, schools are spending millions on high-tech purifiers. But are they safe? May 27, 2021 | Mother Jones
Posted on November 23rd, 2020 by Phill Snel Prof. Jeffrey Siegel | During pandemic, demand outstrips supply for top-quality air filters November 22, 2020 | The Globe and Mail
