Hey Richard! Thanks for giving us a taste of the research that goes into your excellent articles. I guess I could study all those articles and reports myself, but I've declared you to be an EXPERT, at least in my mind, so I rely on your digests and analysis, thank goodness. I notice that more and more studies are emphasizing the decrease in sulfur particulates due to "cleaning up" diesel shipping fuels, as you have been talking about for at least several years.