In April this year, as countries went into lockdown, many got to see and experience a rare occurrence: clear blue skies.
In many European cities, the lockdown allowed city dwellers to see, smell and feel much cleaner air.
In Paris, the air was cleaner than any time during the past 40 years, and the inhabitants of Milan reported being able to clearly...
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Barbara Stoll is campaign director of the Clean Cities Campaign at Transport & Environment, a clean transport NGO in Brussels. Zoltán Massay-Kosubek is policy manager for clean air and sustainable mobility at the European Public Health Alliance (EPHA), an NGO alliance of public health organisations, including patient and population groups, health professionals and disease groups.