The ordinance, aimed at improving air quality and reducing pollution, was approved thanks to the casting vote of Mayor Candelaria Testa, following a clash between the local government and opposition groups. The Councilor for Ecological Transition, Trinidad Castillo, defended the proposal, arguing it is based on technical reports and that the limitations will only affect 2.5% of the vehicle fleet, specifically those without an environmental sticker whose owners do not reside in Alcorcón.

Vox spokesperson Pedro Moreno labeled the initiative "social engineering" and criticized it for harming workers and families with older vehicles, demanding the ordinance be completely withdrawn. The People's Party, represented by councilor Luis Saceda, also expressed rejection, deeming the regulation "excessively restrictive" and potentially detrimental to commerce and resident mobility. However, they acknowledged the state mandate for cities over 50,000 inhabitants.

The PP called for greater caution and proportionality, requesting expanded exceptions for residents and self-employed individuals, and a delay in implementation until 2030, while also accusing the executive of planning future regulated parking measures. Castillo responded that the proposal is the "alternative that can cause the least harm" and highlighted the numerous exceptions included to facilitate access for those traveling to Alcorcón for work, health, or personal reasons.

Mayor Candelaria Testa concluded the debate by accusing the PP of creating alarm with "false" interpretations and denied that the ordinance includes regulated parking. She also announced that the City Council will maintain existing aid programs to promote energy transition, including the purchase of electric vehicles.