<prompt> Translate the following text to SwahiliThe National Academy of Sciences, in their report on research priorities for PM NAS, 1998, indicates that there is a great deal of uncertainty about the implications of the findings of an association between PM and premature mortality for risk management, due to the limited scientific information about the specific types of particles that might cause adverse health effects, the contributions of particles of outdoor origin to actual human exposures, the toxicological mechanisms by which the particles might cause adverse health effects, and other important questions.  <response>: Mwaka 1998 Chuo Kikuu cha Sayansi cha Marekani kilitoa ripoti ya Uchunguzi wa kipaumbele kwa PM ambapo ilisema: Kuna uhakika mkubwa kuhusu athari za matokeo ya utafiti wa PM kwa usimamizi wa hatari, kutokana na habari ndogo ya kisayansi kuhusu aina maalum za chembechembe ambazo zinaweza kusababisha athari mbaya kwa afya, mchango wa chembechembe za nje kwa athari halisi za binadamu, na utaratibu wa sumu ambao chembechembe zinaweza kusababisha athari mbaya kwa afya. 