The outlawing of internal combustion engines has officially begun, with Stuttgart being the first to do so. The German city, which is home to Mercedes-Benz and Porsche, has begun banning diesel vehicles up to the Euro 4 emissions standard starting from April 1 – and no, that’s not a joke.

According to Automotive News Europe, the ruling – which will affect not only incoming visitors but also those who live in Stuttgart itself – will bar these oil-burning vehicles from being driven or parked in the city unless drivers can obtain an exemption.

Although cars conforming to standards Euro 5 and above are spared for now, the local government said it will make a decision on a more widespread ban after examining emissions results in the middle of the year.

This follows after the city failed to overturn a court ruling to ban Euro 5 diesel vehicles from the city centre by end-2019, a result of being sued by environmental group DUH for failing to uphold European Union clean air rules. In February last year, Germany’s highest administrative court ruled that banning diesel passenger cars is legally permissible in cities, with Frankfurt, Hamburg and Berlin now allowed to implement similar bans.

The ban was first announced by the Baden-Württemberg state government in July, Deutsche Welle reported. “From 2019 there will be a driving restriction in the green environmental zone for older diesel Euro 4 and below with a transitional arrangement for local residents and reasonable exceptions for tradesmen and delivery services,” said head of the ruling Green parliamentary group Andreas Schwarz at the time.

Referring to Volkswagen’s “Dieselgate” emissions cheating scandal, Germany’s environmental minister Svenja Schulze responded by urging the federal government to set rules on recalls for affected cars.

“The longer you wait for older diesels to be retrofitted with hardware, the more likely we are to see driving bans. Now diesel owners have to pay for the massive mistakes of the car industry,” she said, adding that without these technical updates “we will be unable to reach our goal of making the air in the cities cleaner.”