hongkongfooey;
Of course everything you say is perfectly correct and the test would have been more convincing on a day when it was socked in with a pollution index of 120 !! I asked about purchasing an IQ hand held digital particle scanner similar to the one used on the test and was told can do at $HK 25,200. Another interesting fact that came to light was that the IQ250 model has three filters and the IQ150 has only two filters. Not sure what the third filter is for. I'm in touch with the engineering department of the agents to try and find out. Regards,
Prince of Dzun.