Dust masks and other forms of respiratory protection, which are sized for adults and not children, are not recommended for protection against outdoor air pollution. Not only do poor fit and uncertain compliance limit any potential benefits, but also most simple dust masks do not include the materials needed to filter out harmful VOCs or ozone. These issues are unrelated. 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.