RT Journal Article T1 Light pollution and the concentration of anthropogenic photons in the terrestrial atmosphere A1 Bará Viñas, Salvador A1 Bao Varela, María del Carmen A1 Falchi, Fabio K1 Light pollution K1 Nocturnal environment K1 Radiometry K1 Photometry K1 Air pollution AB Light pollution can be rigorously described in terms of the volume concentration of anthropogenic photons (light quanta) in the terrestrial atmosphere. This formulation, consistent with the basic physics of the emission, scattering and absorption of light, allows one to express light pollution levels in terms of particle volume concentrations, in a completely analogous way as it is currently done with other classical pollutants, like particulate matter or molecular contaminants. In this work we provide the explicit conversion equations between the photon volume concentration and the traditional light photometry quantities. This equivalent description of the light pollution levels provides some relevant insights that help to identify artificial light at night as a standard pollutant. It also enables a complementary way of expressing artificial light exposures for environmental and public health research and regulatory purposes. PB Elsevier YR 2022 FD 2022-08-24 LK https://hdl.handle.net/10347/44396 UL https://hdl.handle.net/10347/44396 LA eng NO Bará, S., Bao-Varela, C., & Falchi, F. (2022). Light pollution and the concentration of anthropogenic photons in the terrestrial atmosphere. Atmospheric Pollution Research, 13(9), 101541. doi:10.1016/j.apr.2022.101541 DS Minerva RD 28 abr 2026