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Evidence to advocate for cleaner air for people with asthma is not in short supply. We know that air pollution is associated with the development and worsening of the condition and that mitigating interventions can improve respiratory outcomes. We have clear targets, particularly traffic emissions, especially in urban areas, and plenty of potentially effective actions. Road traffic must be reduced, and what remains should be cleaner and greener. Urban green spaces, safe cycle networks and wider pavements will promote active travel and leisure time exercise. Healthcare professionals must ensure people are aware of their air quality, its impact on asthma and the appropriate behaviour to safeguard health. What remains are realistic policies and effective measures, based on the correct scientific evidence, to be taken forth with political courage and investment so that air pollution no longer contributes to the development or worsening of respiratory ill health.

Air quality in subway systems is of interest not only because particulate matter (PM) concentrations can be high, but also because of the peculiarly metalliferous chemical character of the particles, most of which differ radically from those of outdoor ambient air. We report on the oxidative potential (OP) of PM2.5 samples collected in the Barcelona subway system in different types of stations. The PM chemical composition of these samples showed typically high concentrations of Fe, Total Carbon, Ba, Cu, Mn, Zn and Cr sourced from rail tracks, wheels, catenaries, brake pads and pantographs. Two toxicological indicators of oxidative activity, ascorbic acid (AA) oxidation (expressed as OPAA μg−1 or OPAA m−3) and glutathione (GSH) oxidation (expressed as OPGSH μg−1 or OPGSH m−3), showed low OP for all samples (compared with outdoor air) but considerable variation between stations (0.9–2.4 OPAA μg−1; 0.4–1.9 OPGSH μg−1). Results indicate that subway PM toxicity is not related to variations in PM2.5 concentrations produced by ventilation changes, tunnel works, or station design, but may be affected more by the presence of metallic trace elements such as Cu and Sb sourced from brakes and pantographs. The OP assays employed do not reveal toxic effects from the highly ferruginous component present in subway dust. © 2016 The Authors ; This study was supported by the Spanish Ministry of Economy and Competitiveness and FEDER funds (METRO CGL2012-33066 ), the I MPROVE LIFE Project ( LIFE13 ENV/ES/000263 ) and the European Union Seventh Framework Programme ( FP7/2007-2013 ) under grant agreement no. 315760 HEXACOMM. Support is also acknowledged to Generalitat de Catalunya 2014 SGR33 . Fulvio Amato is beneficiary of an AXA Research Fund postdoctoral grant . In the UK the research was funded by the National Institute for Health Research Health Protection Research Unit (NIHR HPRU) in Health Impact of Environmental Hazards at King's College London in partnership with Public Health England (PHE). The views expressed are those of the authors and not necessarily those of the NHS, the NIHR, the Department of Health or Public Health England. Special thanks to Wes Gibbons for improving an early draft of the manuscript. Appendix A ; Peer reviewed

Background The evidence on the association between ultrafine (UFP) particles and mortality is still inconsistent. Moreover, health effects of specific UFP sources have not been explored. We assessed the impact of UFP sources on daily mortality in Barcelona, Helsinki, London, and Zurich. Methods UFP sources were previously identified and quantified for the four cities: daily contributions of photonucleation, two traffic sources (fresh traffic and urban, with size mode around 30 nm and 70 nm, respectively), and secondary aerosols were obtained from data from an urban background station. Different periods were investigated in each city: Barcelona 2013–2016, Helsinki 2009–2016, London 2010–2016, and Zurich 2011–2014. The associations between total particle number concentrations (PNC) and UFP sources and daily (natural, cardiovascular [CVD], and respiratory) mortality were investigated using city-specific generalized linear models (GLM) with quasi-Poisson regression. Results We found inconsistent results across cities, sources, and lags for associations with natural, CVD, and respiratory mortality. Increased risk was observed for total PNC and natural mortality in Helsinki (lag 2; 1.3% [0.07%, 2.5%]), CVD mortality in Barcelona (lag 1; 3.7% [0.17%, 7.4%]) and Zurich (lag 0; 3.8% [0.31%, 7.4%]), and respiratory mortality in London (lag 3; 2.6% [0.84%, 4.45%]) and Zurich (lag 1; 9.4% [1.0%, 17.9%]). A similar pattern of associations between health outcomes and total PNC was followed by the fresh traffic source, for which we also found the same associations and lags as for total PNC. The urban source (mostly aged traffic) was associated with respiratory mortality in Zurich (lag 1; 12.5% [1.7%, 24.2%]) and London (lag 3; 2.4% [0.90%, 4.0%]) while the secondary source was associated with respiratory mortality in Zurich (lag 1: 12.0% [0.63%, 24.5%]) and Helsinki (4.7% [0.11%, 9.5%]). Reduced risk for the photonucleation source was observed for respiratory mortality in Barcelona (lag 2, −8.6% [−14.5%, −2.4%]) and for CVD mortality in Helsinki, as this source is present only in clean atmospheres (lag 1, −1.48 [−2.75, −0.21]). Conclusions We found inconsistent results across cities, sources and lags for associations with natural, CVD, and respiratory mortality. ; This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 747882. While writing the manuscript, Dr. Rivas was funded by the postdoctoral fellowship programme Beatriu de Pinós (2018 BP 00114), funded by the Secretary of Universities and Research (Government of Catalonia) and by the Horizon 2020 programme of research and innovation of the European Union under the Marie Sklodowska-Curie grant agreement No 801370. Currently, Dr. Rivas is funded by the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 886121. This work was supported by FEDER funds; projects HOUSE (CGL2016-78594-R) and CAIAC (PID2019-108990RB-I00), the Government of Catalonia (AGAUR 2017 SGR41). The authors also acknowledge the Project PI16/00118 funded by the Instituto de Salud Carlos III and co-funded by the European Regional Development Fund (ERDF) "A way to make Europe". HW's post was partially funded by the UK National Institute for Health Research Health Protection Research Unit on Environmental Exposures and Health at Imperial College London in partnership with Public Health England, King's College London and the MTC Toxicology Unit, Cambridge. The views expressed are those of the authors and not necessarily those of the NHS, the NIHR, the Department of Health & Social Care or Public Health England. This work was produced using statistical data from ONS. The use of the ONS statistical data in this work does not imply the endorsement of the ONS in relation to the interpretation or analysis of the statistical data. This work uses research datasets which may not exactly reproduce National Statistics aggregates. ; Peer reviewed

Perspectives from worldwide experts on how major cities across the globe are responding to the major environmental threats of our time, including global climate change Over half of the world's population now lives in cities, and this share is expected to increase in the coming decades. With growing urbanization, cities and their residents face substantial environmental challenges such as higher temperatures, droughts, wildfires, and increased flooding. In response to these pressing challenges, some cities have begun to develop local environmental regulations that supplement national and environmental laws. In so doing, cities have stepped into a role that has been historically dominated by higher levels of government.Global Sustainable Cities takes stock of the policies that have been implemented by cities around the world in recent years in several key areas: water, air pollution, greenhouse gas emissions, and climate adaptation. It examines the advantages—and potential drawbacks—of allowing cities to assume a significant role in environmental regulation, given the legal and political constraints in which cities operate.The contributors present a series of case studies of the actions that seven leading cities—Abu Dhabi, Beijing, Berlin, Delhi, London, New York, and Shanghai—are taking to improve their environments and adapt to climate change. The first volume of its kind, Global Sustainable Cities is a critical comparative assessment of the actions that major cities in the global North and South are taking to advance sustainability