This report chapter examines measurements of ultrafine particles (UFPs) — very tiny airborne particles smaller than 0.1 micrometers — and their potential health effects, including risks to neurological, respiratory, and cardiovascular health. UFPs make up roughly 90% of all airborne particles and are primarily produced by fuel combustion sources such as diesel engines, gasoline engines, and jet engines. People living near heavily trafficked roads, airports, refineries, and railyards may face elevated exposure to these particles.Open full document
Notes
Chapter 5 of the MATES V Draft Report covers ultrafine particle (UFP) and black carbon measurements, focusing on fixed-site monitoring. The chapter provides background on UFPs, noting their association with neurological, respiratory, and cardiovascular health effects, and explains that total particle number concentration is used as a proxy for UFP concentration. It discusses the primary sources of UFPs in urban areas, including vehicle exhaust, airports, refineries, and railyards.