1000 European cities try to go car-free for a day

According to an article in the KCStar:
Many European towns restricted traffic, offered cheap subway rides or lent bikes in an experiment Monday to cut air pollution - a problem that aggravated Europe's deadly heat wave this summer.

The event was part of "European Mobility Week," whose organizers say that 40 percent of the transport sector's carbon-dioxide emissions come from private cars in cities.
The Mobility Week web site has more details.