Particulate matter (PM2.5):NFr:Pt:^Patient:Qn
particulate matter (pm2.5):nfr:pt:^patient:qn
Particulate matter (PM2.5):Number Fraction:To identify measures at a point in time:^Patient:Quantitative
particulate matter (pm2.5):number fraction:to identify measures at a point in time:^patient:quantitative