Quote:
Originally Posted by oldtamiyaphile
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If you like nanoparticles that bypass your lungs and go straight into your blood stream. At least with black smoke you can turn the a/c to recycle or hold your breath.
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Nano sized particles are not a PRODUCT of DPFs. They have always been part of the particulate mix. The use of DPFs removes particles down to the micron size. The nano sized particles are allowed through but the over all reduction in mass of particulates is to be at 85% or greater. Current studies have shown the danger of nano carcinogens as emitted by modern diesels, but the dangers are smaller than the well known bulk ingestion of carcinogenic particles - though the dangers are still there. Modern diesel fuel systems as well as particle traps just move the emissions into the nano scale region but the over all mass is much reduced.
Gasoline Direct Injection engines also produce a small amount of nano scale carcinogens. Many industrial processes as well as natural processes emit nano scale carcinogens. Your campfire and barbeque are included in that list. The thrust of the studies is to quantify the danger and produce proper guidelines for control. We have used the term "low hanging fruit" in this thread, and the bulk emissions have been dealt with and now the more subtle dangers are to be addressed.