Wearable camera-derived microenvironments in relation to personal exposure to PM2.5 by Salmon, M, Milà, C, Bhogadi, S, Addanki, S, Madhira, P, Muddepaka, N, Mora, A, Sanchez, M, Kinra, S, Sreekanth, V, Doherty, A, Marshall, J, Tonne, C