<p>Recent assessments have been undertaken of the health effects of long-term exposure to the air pollution mixture in the United Kingdom, but no separate assessments of the impact of the PM1 and PM0.1 components (particulate matter with an aerodynamic diameter smaller than 1 or 0.1 microns, respectively) of particulate air pollution have been produced.</p><p> </p><p>The reviews by the Health Effects Institute and the World Health Organization about the effects of different components of air pollution, including ultrafine particles (PM0.1), concluded that there is currently limited evidence on the effects on health of ultrafine particles. These reviews are available at the following link:</p><p> </p><p><a href="https://www.healtheffects.org/publication/understanding-health-effects-ambient-ultrafine-particles" target="_blank">https://www.healtheffects.org/publication/understanding-health-effects-ambient-ultrafine-particles</a></p><p> </p><p><a href="http://www.euro.who.int/__data/assets/pdf_file/0004/193108/REVIHAAP-Final-technical-report-final-version.pdf?ua=1" target="_blank">http://www.euro.who.int/__data/assets/pdf_file/0004/193108/REVIHAAP-Final-technical-report-final-version.pdf?ua=1</a></p><p> </p><p>Currently, Public Health England has no plans to engage in work on the effects of PM1 and PM0.1 particles on human health over the coming year.</p>