What does OPC stand for?

In view of the above discussion, this paper compares four analytical methods: (i) gravimetric analysis, (ii) UV spectroscopy, (iii) optical particle counter (OPC), and (iv) epifluorescence microscopy (henceforth microscopy).

[FIGURE 3 OMITTED] Other instrumentation included type T thermocouples for air temperature measurement, type K thermocouples for appliance temperature measurements, a portable hot film anemometer for air velocity measurements in the exhaust duct, an optical particle counter for checking the uniformity of aerosol distribution in the exhaust duct, and an electrical power data logger and a natural gas flowmeter to measure the energy input rates into the appliances.

Our purpose was to determine the relationship between particle number concentrations obtained from an optical particle counter (OPC) and daily mortality, and also to identify susceptible groups and the effects of particulate matter on cause-specific mortality.