When lead was taken out of automobile fuel for good in 1996, the next, largest source of NEW lead in the environment has been leaded AvGas fuel used by general aviation (GA) airplanes. Well over 66% of all new lead emissions in Arizona are from this source - yet you do not list it as a source. Maricopa County, out of over 3000 counties in the US is number one in total lead emissions from this source each year. It amounts to well over 4 tons of breathable lead into our bodies every year. Out of the 292 zip codes in Maricopa County, almost half (142) of them are listed in the "high risk" for lead risk. This information is not new. It is time to find out what has been going on at Reid-Hillview airport in San Jose, California. The 40 airports in Maricopa County are blanketing the children living there with these lead emissions. If you can't stop the NEW emissions, how will you ever get rid of old lead?