<prompt> Translate the following text to EnglishZaidi ya masomo kumi na mbili wamegundua uhusiano muhimu kati ya vipimo mbalimbali vya muda mrefu wa kuambukizwa kwa PM na viwango vya juu vya vifo vya kila mwaka.  <response>: Over a dozen studies have found significant associations between various measures of long-term exposure to PM and elevated rates of annual mortality e.g. 