West Coast social media users are sharing their DIY tips for building an air purifier at home as smoke from Canada wildfires are cloaking much of the East Coast. In videos online, social media users are sharing their instructions on building a Corsi-Rosenthal air purifier. The relatively inexpensive air purifier relies on four air filters and one box fan. Angel Robertson's TikTok video on her DIY purifier has amassed more than 600,000 views. Robertson shared her video after seeing New Yorkers share their experiences with the smoke on TikTok and wanted to share her tips.