<prompt> Translate the following text to SwahiliHowever, most of the studies examined by Ito and Thurston only controlled for PM10 or broader measures of particles and did not directly control for PM2.  <response>: Hata hivyo, utafiti uliofanywa na Ito na Thurston ulionyesha kuwa PM10 ni moja ya vipimo vya juu zaidi vya chembechembe na sio PM2. 