Indoor air quality has become a personal matter for Shawn Stone.

His Toronto-based electronics distribution company, International Electronic Components Inc., which serves the health-care sector, was deemed an essential business by the Ontario government in March 2020, at the beginning of the pandemic.

With a dozen or so employees coming in and out of the office when necessary, he tried to follow government guidelines to protect them from COVID-19 — including everything from masking, temperature checks and hand sanitizer, to installing Plexiglass barriers between cubicles.

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