Measured concentrations reached up to 37.5 nanograms (that’s a billionth of a gram!) per cubic meter of air.
Nearly nothing, in other words... not that it matters anyway, because it's all practically inert. Perhaps they will serve as evidence to future historians of an era of progress before radical misguided environmentalism took over and plunged civilisation into another dark age.
Nearly nothing, in other words... not that it matters anyway, because it's all practically inert. Perhaps they will serve as evidence to future historians of an era of progress before radical misguided environmentalism took over and plunged civilisation into another dark age.