German citizens are suing their government over its failure to bring down air pollution levels to limits recommended by the world’s leading scientists. The seven claimants, supported by environmental organizations ClientEarth and Deutsche Umwelthilfe [German Environment Help], last week launched the case in the Federal Administrative Court — Germany’s highest court. They argue German law breaches their fundamental rights, since it allows air pollution levels to be four to five times higher than those the World Health Organization (WHO) deems acceptable. “Air pollution may not often be named the official cause of death, but it claims lives — and causes...