The Health Minister, Mark Drakeford AM, says despite an increase in the numbers of people who don't smoke in cars when children are present there is still a stubborn percentage of people who still do. He says he wants to close that gap and introducing the law will make the final difference.
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It's hoped more people will consider using their local service amid concerns over the future of the bus industry.
Dry across the country this evening with broken cloud and some late sunshine. Scattered showers expected tomorrow.
40,000 people are expected at the motorbike event in the capital this weekend.