Wood pellets are increasingly used for space heating globally.
Prior work has shown that stored bulk wood pellets produce sufficient carbon
monoxide (CO) to represent a health concern and exceed regulatory standards for
occupational exposures. However, most of the pellets used for residential heating
are sold in smaller plastic bags. This study, published in the Annals of Work Exposures
and Health, measured CO emission factors from fresh, bagged-wood pellets as a
function of temperature and relative humidity. CO concentrations increased with
increasing temperature and moisture in the container. CO measurements in a
pellet mill warehouse with stored pallets of bagged pellets had 8-h average CO
concentrations up to 100 ppm exceeding occupational standards for worker
exposure. Thus, manufacturers, distributors, and home owners should be aware of
the potential for CO in storage areas and design facilities with appropriate
ventilation and CO sensors.
AplusA-online.de - Source: Annals of Work Exposures and Health