Peak event analysis: a novel empirical method for the evaluation of elevated particulate events(12 page pdf, Aaron Orkin, Pamela Leece, Thomas Piggott, Paul Burt, Ray Copes, Environmental Health, Nov. 1, 2013)
Today we review research into the occurrence of brief peaks of suspended particles (or dust), how often they occur (in a rural area of southern Ontario) and if the results point to a need for standards for periods of less than an hour- the shortest time period currently used in Canada and many other countries. The resulting analysis showed that peak values of PM10 twenty to one hundred times greater than values averaged over an hour which were within the current standards. Although the aim of the research was to examine single events with high associated levels of pollution, one cannot help but wonder what the health impacts would be for people exposed to repeated doses of high pollution for shorter periods than are covered by existing standards, such as proximity to roadside emissions at rush hour each day. If there is a definable health impact, that would both call for standards for shorter periods- say 10 minutes or one minute- and might explain the degree of mortality associated with traffic (which has been estimated as about 1/3 of all deaths from outdoor air pollution in a study conducted by the City of Toronto Medical Officer of Health).
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