FAA has already grounded Starship from further flights after this event, till they investigate matter on their own. There are also reports of dust clouds triggered by the explosion in Texas dropping dust in a large area in Texas.
So this is par for the course, and unless the investigation turns up an issue that entails unacceptable risk to people, natural environment, or built environment we should see a return to flight as soon as the launchpad is rebuilt etc.
SpaceX has specifically told folks in the town not to touch any debris or handle and call them.
They are also VERY careful about handling dragon capsules etc. though I think that’s more for the thruster, rather than the engines.
I know ch4+o2 should convert to co2 and h2o but I’m unsure what other particulate could be included in the dust. Like concrete remnants (concrete dust is really bad to breathe) paint, or other additives or chemicals that were still n the pad and rocket.
I wonder if Texas experiences any natural dust storms.