Are Airborne Ultrafine Particles the Next Frontier in Air Pollution Research?

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• Professor Roy Harrison
• Tuesday 17 March 2026, 18:00-19:00
• Pfizer Lecture Theatre, Department of Chemistry, Lensfield Road.

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The atmosphere contains a high number density of particles whose sizes range over many orders of magnitude from 2 nm to over 100 µm in diameter. Airborne particulate matter is the air pollutant causing the greatest adverse effects upon human health, with most studies focussing upon particles of smaller than 10 µm diameter (referred to as PM10 ) or smaller than 2.5 µm (referred to as PM2 .5), measured as mass per unit volume of air. Recently, there has been an increased focus upon the nanoparticle fraction, usually described by the term ultrafine particles, which refers to particles with a diameter of

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