Section .0400-Ambient Air Quality Standards Section .0400 - Ambient Air Quality Standards 0401 Purpose 0402 Sulfur Oxides 0403 Total Suspended Particulates 0404 Carbon Monoxide 0405 Ozone 0406 Hydrocarbons (Repealed) 0407 Nitrogen Dioxide 0408 Lead 0409 PM10 Particulate Matter 0410 PM2.5 Particulate Matter