On April 23, 2020, Sheryl L. Dolan, Senior Regulatory Consultant, Bergeson & Campbell, P.C. (B&C^®), was quoted by Bloomberg Environment regarding EPA enforcement actions targeting unsubstantiated marketing claims that products protect against viruses, including Covid-19. 

“If they’re making claims that the device treats the ambient air around us, but the virus isn’t expected to be there, it doesn’t actually protect anyone,” said Sheryl Dolan, a senior regulatory consultant at Bergeson and Campbell PC.

“So, the claims these companies are making could be true, but that’s not how you get the virus,” she said.

See - https://bnanews.bna.com/environment-and-energy/air-purifiers-making-covid-19-claims-face-legal-financial-risks (subscription required)