The EU has progressively tightened limits since "Euro 1" in 1992. The Commission's proposal widens real-driving emissions (RDE) testing and adds continuous testing of emissions via an on-board monitoring system. Euro 7 would take effect in mid-2025 for cars and in mid-2027 for trucks and buses. The European Commission estimates Euro 7 could add up to 150 euros to car prices and 2,600 euros for trucks and buses. A Commission spokesperson declined to comment on executives' statements, but said Euro 7's real-driving emissions tests were important because of "scandals in the past about cheating devices".

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