“… “Air pollution continues to plague the UK,” he said. “I am alarmed that despite repeated judicial instruction, the UK government continues to flout its duty to ensure adequate air quality and protect the rights to life and health of its citizens. It has violated its obligations.” …

https://www.theguardian.com/environment/2017/sep/10/uk-flouting-duty-to-cut-air-pollution-deaths-says-un-human-rights-report