<prompt> Translate the following text to EnglishUchunguzi wa muda mfupi unahusu mabadiliko ya muda mfupi mara nyingi ya kila siku katika viwango vya PM na mabadiliko katika viwango vya kila siku vya vifo hadi siku kadhaa baada ya kipindi cha viwango vya PM vilivyoinuka.  <response>: Short-term studies relate shortterm often day-to-day changes in PM concentrations and changes in daily mortality rates up to several days after a period of elevated PM concentrations. 