The day is marked on September 22 every year and encourages motorists not to use their vehicles.
The day comes at the end of European Mobility Week, which this year aimed to encourage people and local authorities across Europe to take steps to achieve the long-term goal of a carbon-neutral continent.
According to a report by the World Health Organisation (WHO), out of the 50 European cities most affected by smog, 33 are in Poland.
The WHO has estimated that around 50,000 Poles die every year due to illness caused by air pollution.
Scientists estimate that between 60 and 80 percent of air pollution in big Polish cities comes from road transport, public broadcaster Polish Radio’s IAR news agency reported last year.
(pk/gs)
Source: IAR