The report, submitted on April 14, 2026, concludes that the new infrastructure will not comply with European air quality regulations and will lead to an increase in emissions. Furthermore, the Environmental Impact Statement (EIS) itself acknowledges that the project will increase greenhouse gas emissions in all scenarios.

Traffic models from the Bizkaia Provincial Council predict a 21% increase in private vehicle mobility by 2038 and 33% by 2048. Regarding air quality, they have denounced that the project goes against Directive 2024/2881 (EU), as new European limits will be in force by the time the tunnel is operational (from 2030 onwards).

The platforms warn that concentrations of NO2 and PM particles in homes and schools in the Artatza area will exceed these limits. The "do no significant harm" principle prohibits approving projects that increase pollution levels when an area is already at its limit.

Additionally, the platforms have criticized "hasty" decisions and procedural errors, stating that the Provincial Council approved the project in July 2025, while the public information period for the URA agency was still open and without fulfilling some conditions established by the EIS. They consider the project's 543 million euro budget to be "poorly invested" and advocate for these funds to be allocated to structural solutions that reduce traffic without increasing emissions or destroying the Artatza park.

They also highlighted that the construction work would last more than eight years, subjecting residents and students to noise and particulate matter. Consequently, they have called on all citizens of Bizkaia to demand the paralysis of the Lamiako underwater tunnel, with a mobilization scheduled for April 25 in Erromo (Getxo) at 6:00 PM.