Paris - Paris has temporarily barred half of all cars from traveling on city streets and made public transportation free for the day as it battles a peak in pollution.
Facing red-alert levels of pollution since November 30, Paris City Hall said the situation poses a significant risk to residents' health.
Fighting pollution
Authorities say pollution is due to weather conditions and a heavy dependence on diesel fuel.
To tackle what City Hall describes as an "exceptionally serious" crisis, Paris's Velib bike-share and Autolib electric cars were made free on Tuesday December 6), as well as the Paris metro and bus services.
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In addition, only cars with even-numbered plates were allowed to drive Tuesday in the French capital and its close suburbs.
City officials say it's the ninth time this year that Paris is facing a pollution peak.