Williams, K R; Ciupek, K; Tompkins, J T; Brown, A S; Allerton, J J; Butterfield, D M; Kean, M N; Robins, C C; Schmeer, J L; Singh, G K; Tipler, J M; Tomson, M; Walker, D J W; Priestman, M D S; Tremper, A H; Ek, D E B; Green, D C (2025) Airborne Particle Concentrations, Particle Numbers and Black Carbon in the United Kingdom - Annual Report 2024. NPL Report. ENV 61