Issues with Monitoring SO2 Emissions

Increasingly stringent legislation in the European Union has driven down SO2 emissions on many processes from the 100's mg.m-3 to the 10's mg.m-3, or in some cases even lower. Consequently, the measurement challenge to accredited providers of compliance measurements and EN 14181 QAL2 calibrations has become increasingly difficult, and meeting legislative uncertainty requirements far from a trivial matter. We take stock of current capability for measuring this important pollutant and present some recent results to feed into the growing debate regarding community capability to enforce existing emission limits, and the feasibility of even further decreases in such limits in the future.