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Seven million people die from air pollution every year.
But 'baby' Claire is here to help in Antwerp, Belgium.
Claire is a doll and her name means "Clean Air for Everyone".
People take Claire for walks in her pushchair.
Next to the doll, scientists have placed electronic equipment which measures the air pollution.
Only 11 million people live in Belgium.
But it is one of the most polluted countries in Europe.
It has very bad traffic.
Roeland Samson is a professor at the University of Antwerp.
Veerle Bonaers is a volunteer for the project.
She explains why it's important to her.
Joeri Thijs from Greenpeace thinks transport needs to change.
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