Personal PM2.5 and indoor CO in nomadic tents using open and chimney biomass stoves on the Tibetan Plateau

► PM2.5 and CO variations within 9 tents of nomadic Tibetan herders were measured. ► Time-activity patterns of these herders were recorded. ► Diurnal variability of PM2.5 and CO was similar and had multiple peaks. ► Average concentrations of PM2.5 and CO in tents using open stove were high. ► Women and children were exposed to higher levels of pollutants than other residents.