I gather that higher-than-ambient CO2 "domes" can form above urban areas, enhancing other local air pollution. Are there papers or datasets of average CO2 concentrations down at ground level (say 0-20 metres upwards from the ground), in the spaces between buildings - streets, parks and so on?
From what I've read, CO2 concentrations at higher levels are more temporally stable, but understate concentrations across the city; whereas monitoring stations down at street level give representative concentrations for that specific place, but are temporally highly variable, and comparisons between sites suggest that they are spatially highly variable too.