<prompt> Translate the following text to EnglishHata hivyo, utafiti uliofanywa na Ito na Thurston ulionyesha kuwa PM10 ni moja ya vipimo vya juu zaidi vya chembechembe na sio PM2.  <response>: However, 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. 