<prompt> Translate the following text to EnglishHii inaweza kuwa matokeo ya sababu kadhaa, kama vile tofauti katika unyeti wa jamaa wa idadi hizi mbili kwa uchafuzi wa PM na tofauti katika muundo wa PM katika maeneo haya mawili.  <response>: This may result from a number of factors, such as differences in the relative sensitivity of these two populations to PM pollution and differences in the composition of PM in these two locations. 