There are places in Texas where toxic levels of Benzene are being emitted into the air and people ARE ill from it. There are also places in Texas, like where I live, that don't have any type of vehicle emissions testing or ENFORCEMENT. There are many oil burning vehicles around my city. In the city's defense, many of them are from Oklahoma, which has NO vehicle inspection requirement. One simple step as to the vehicles, it sure would be nice IF the police would do their job and cite these obviously polluting vehicles. They used to do that, but not any more. The other step is to fail the Texas vehicles if they are emitting smoke on annual inspection. (I've been somewhat sensitive to exhaust emissions and diesel emissions since Desert Storm. They make me physically ill, give me headaches and nausea. It MAY have something to do with being off of the coast of Kuwait for so long with the burning oil wells)