CFR › Title 26 › Part 52Part 52 — Environmental Taxes§ 52.0-1— Introduction.§ 52.4681-1— Taxes imposed with respect to ozone-depleting chemicals.§ 52.4682-1— Ozone-depleting chemicals.§ 52.4682-2— Qualifying sales.§ 52.4682-3— Imported taxable products.§ 52.4682-4— Floor stocks tax.§ 52.4682-5— Exports.