Lead concentrations in Detroit, New York, and Los Angeles air.
D000397:Air Pollution / Q000032:analysis*; D002140:California; D002248:Carbon Monoxide / Q000032:analysis; D007854:Lead / Q000032:analysis*; D008824:Michigan; D009519:New York City; D012621:Seasons; D001335:Vehicle Emissions
D001335:Vehicle Emissions; D007854:Lead; D002248:Carbon Monoxide