<prompt> Translate the following text to EnglishKwa sababu ya kuathiriwa kwa PM kwa sababu ya maambukizi ya muda mrefu, utafiti wa kila siku wa safu ya wakati wa PM unaonyesha athari ya muda mrefu ya uchafuzi wa PM kwa afya.  <response>: The fact that the PM-mortality coefficients from the cohort studies are far larger than the coefficients derived from the daily time-series studies provides some evidence for an independent chronic effect of PM pollution on health. 