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“Why isn’t a more thorough investigation being done to look for suspended particles that are too light to settle on surfaces and that are still of respirable size, small enough to get into your lower lung?” said Dawn Bolstad-Johnson, an industrial hygienist who has studied exposures in post-fire environments.

“The fabrication industry staunchly supports focused regulatory oversight and enforcement of workplace conditions that pose health risks from respirable crystalline silica,” it said.

The Labor Department rule lowers the permissible exposure limit of respirable crystalline silica to 50 micrograms per cubic meter of air for a full-shift exposure, calculated as an 8-hour average.

Not understanding that it's inhalation, and that there's plenty of things bigger than respirable aerosols that can deposit in your nose, and in your large airways; and if there are susceptible cells there, it can cause infection; and can still hang in the air.

“The contribution of small respirable particles, sometimes called aerosols or droplet nuclei, to close proximity transmission is currently uncertain. However, airborne transmission from person-to-person over long distances is unlikely,” according to the guidance.