Ajuntament de Barcelona Glories tunnel air quality improment table 2
Ajuntament de Barcelona Servei de Premsa https://ajuntament.barcelona.cat/premsa/2022/08/19/lobertura-del-tunel-de-glories-ha-permes-reduir-en-un-39-i-un-7-la-presencia-de-no2-i-pm10-en-aquest-ambit-de-la-ciutat/
Catalunya, Spain
cover tunnel photo by: Matt Brown from London, England / CC BY
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