Ozone in the troposphere, or ground levels, is a major component of urban smog and a health hazard. The formation of ground level ozone is independent of ozone in the upper atmosphere, or stratosphere. Stratospheric ozone provides a protective shield absorbing harmful ultraviolet radiation. Too little stratospheric ozone increases the risk of skin cancer and eye damage from ultraviolet rays. Lead We have ceramic dishes.
Some ceramic dishes contain lead.
Such dishes should not be used to cook or store food, since the acids can leach large amounts of lead from dishes into de food. Occasionally lead may contaminate food. Soil lead is taken up by root vegetable and atmospheric lead may fall onto leafy vegetables. Cans with soldered seams can also add lead to foods. Hygiene measures are key.