Characteristics of indoor and outdoor particle concentrations in air conditioning rooms in summer, Shanghai

The time series of indoor/outdoor PM10, PM2.5 and number concentrations are monitored in two types of air-conditioning rooms in Shanghai City in summer. The relationship of PM10, PM2.5, number concentrations and ratio of indoor to outdoor between indoor and outdoor of the rooms, which are equipped with wall-mounting air conditioner and central air-conditioner, are analyzed and discussed, respectively. The testing data show that inner aerosol emission is the main source of wall-mounting air-conditioned rooms, but in central air-conditioning systems, indoor PM2.5 levels are primarily affected by the ambient aerosol concentrations.