(EN) Andrew Wasley, Alexandra Heal, Fiona Harvey e Mie Lainio, Revealed: UK government failing to tackle rise of serious air pollutant, in The Guardian, 13 giugno 2019, ISSN 0261-3077 (WC · ACNP). URL consultato il 14 giugno 2019.
«PM2.5 is probably responsible for somewhere between half and three-quarters of the total harm we derive as humans from air pollution»