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Ultrafine particles (UFPs) are particles smaller than 100 nm and belong to the fine particle class (< 1,000 nm).1 Due to their minuscule size, UFPs don’t significantly impact mass-based air quality measurements, which are the standard for many air quality regulations. UFPs, however, play a unique role in the atmosphere and, when inhaled, can have distinct effects on human health.
Why Measure UFPs?
Despite their low mass, UFPs influence climate, atmospheric behavior, and human health. Measuring UFPs provides valuable data on exposure levels and insight into particle evolution in the atmosphere.
How Are UFPs Measured?
Mass-based methods struggle to detect UFPs. Instead, particle counting techniques that track individual particles provide more accurate data. Number-based measurements capture particle presence in air volume, while sizing capabilities provide a fuller picture by detailing particle size distribution. Both methods benefit from a representative sampling system to ensure accurate readings.
Learn more about the fundamentals of UFP measurement, including particle number concentration (PN) and particle size distribution (PSD).
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