Measurement of 'heavy metals' in particulate matter in outdoor air

Air pollution remains a matter of concern for governments, regulators and the public. Particulate matter (PM) is an important pollutant in this respect, and its composition is thought to be the most critical aspect with regard to its effect on human health. In particular, the presence of 'heavy metals' in PM is known to have toxic effects. This Technical Brief describes the theory and practice of making measurements of metals in particulate matter in outdoor air. It also presents examples of the real-world benefits of these measurements and reviews some of the latest developments in this field.