UPDATE

摘要

The Expert Panel on Air Quality Standards (EPAQS) recent report, published in June, addresses what is the appropriate measurement on which to base a standard for ambient airborne particles. The standard, recommended by the Panel in 1995, is based on measurement of PM_(10). In their new report, the Panel conclude that this metric has stood the test of time and has allowed the demonstration of robust relationships between changes in concentrations of PM_(10) and health effects. They go on to recommend that in the absence of evidence that any alternative metric shows a closer and more reliable association with health outcomes, there is no pressing need to substitute one.