| (A) | A-weighted |
| db | Decibels |
| CO | Carbon monoxide |
| GAM | Generalized Additive Models |
| IDESCAT | Statistical Institute of Catalonia |
| INLA | Integrated Nested Laplace Approximation |
| MCMC | Markov Chain Monte Carlo |
| NO2 | Nitrogen dioxide |
| PC-priors | Penalising complexity priors |
| PM2.5 | 2.5 micrometres diameter particulate matter |
| PM10 | 10 micrometres diameter particulate matter |
| SO2 | Sulphur dioxide |
| SPDE | Stochastic partial differential equations |
| UNPD | United Nations Development Programme |
| WHO | World Health Organisation |
| XVPCA | Catalan Atmospheric Pollution Surveillance and Control Network |
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