Remember when freon refrigerant was outlawed to protect the ozone layer? The unforeseen result was that freon supplies diminished and people died from eating spoiled food for lack of refrigeration. Our pseudo experts didn’t consider that freon is heavier than air and therefore could not have had any affect on the ozone layer.
Having learned nothing from this mistake, we find that these same environmentalists now want to set limits for ozone in ambient air down in the parts per billion range! They haven’t paid attention to the facts that in areas of the earth where there are no humans, the natural ozone concentration exceeds the proposed limits. Maybe we should go back to using freon to reduce ground-level ozone concentrations.