Airborne particulate matter is an important form of pollution, which has generated increasing concern in recent years. As well as contributing to poor visibility and surface soiling, airborne particulate matter can have adverse effects on human health. Construction and other civil engineering sites have been perennial sources of nuisance dust (that is, dust deposited on surfaces and generating complaint). However, there is currently no formal advice or Code of Practice for regulating the emission of particles from construction activity.

A semi-empirical two-compartment constant parameter model is used to predict airborne and surface du t concentrations. The model parameters are air in- and exfiltration internal particle sources, surface deposition caused by settling. Brownian and turbulent diffusion and thermophoresis track-in of dust particle and resuspension. Model predictions are calculated for some typical scenarios, and the soiling rate of a vertical surface is calculated for a range of friction velocities and electric field strengths.

Many significant ASHRAE papers devoted to hospital ventilation have been published. In contrast, literature regarding ventilation in nursing facilities is rare. Nursing facilities are distinctly different from hospitals. This article provides some insight and guidance toward the design for such facilities.

This paper reports the results of thermal comfort and indoor air quality measurements aboard aircraft from 43 flights on commercial airlines with a duration of more than 1 h. The measurements were performed continuously during the whole flight (from the departure gate to the arrival gate), and the parameters monitored were temperature, relative humidity and carbon dioxide concentration. The results were then compared with the ASHRAE Standards for the thermal comfort (ASHRAE Standard 55-92) and indoor air quality (ASHRAE Standard 62-89).