The surge in pollution has been driven by cold weather and near windless conditions that have trapped car exhaust, wood smoke and other pollutants, said the French capital's AirParif air monitoring service.
Though bad by local standards, current levels of fine airborne particles known as PM10 in Paris are around 60 percent of levels in notoriously polluted Beijing and a fraction of readings in New Delhi, known as one of the world's most polluted capitals.
They imposed the same restriction on cars with odd-numbered plates yesterday.
Public transport in the city was also free for a second day running to encourage commuters to leave their vehicles at home, while school children are being prevented from exercising outside.
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For more than a week now, Airparif has published readings of PM10 at more than 80 microgrammes per cubic metre of air particles, triggering the pollution alert.
Other parts of France were also facing pollution alerts, with the air particle concentrations rising to dangerous levels in the southeast and the north of the country.
The central city of Lyon was suffering as pollution gathered in the Rhone Valley, also affecting the Alpine towns of Chambery and Annecy.
The environmentalist candidate in next year's presidential election, Yannick Jadot, said that politicians needed to target the most polluting vehicles and restrict the use of diesel engines.
"We have politicians who tell us they are looking after our health," Jadot said. "The reality is that when they have to choose between traffic, diesel and our health, unfortunately they don't choose our health."
But a parliamentary report has questioned the efficacy of the restrictions, arguing that they do not target the most polluting vehicles.
Despite the measures yesterday, officials reported heavy traffic jams in and around the city in the morning and evening rush hours.
Traffic police were kept busy trying to enforce the anti-pollution measures, fining more than 1,700 motorists for violations.
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