title: Half of wealthy and 98% of poorer cities breach air quality guidelines.
authors.affiliation: London.
authors.forename: Matthew
authors.initials: M
authors.lastname: Limb
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000397:Air Pollution / Q000331:legislation & jurisprudence*; D002947:Cities / Q000706:statistics & numerical data*; D004784:Environmental Monitoring; D052638:Particulate Matter / Q000032:analysis*; D014944:World Health Organization
chemical_list: D000393:Air Pollutants; D052638:Particulate Matter