People jog on the Esplanade du Trocadero in front of the iconic Eiffel tower, in Paris. Photograph: Ludovic Marin/AFP/Getty ImagesPhotograph: Ludovic Marin/AFP/Getty ImagesRoad signs recommending motorists to reduce their speed due to air pollution on the Paris southern ring road. Over 30 departments in France have exceeded the maximum warning threshold for particulate pollution, prompting the French ecology minister to say that the air quality was ‘an emergency and a priority for the government.’ Photograph: Thomas Samson/AFP/Getty ImagesPhotograph: Thomas Samson/AFP/Getty ImagesRoof of Beaubourg centre (left), Notre Dame cathedral (right) and Tour Montparnasse (centre) seen through haze. Pollution in Paris has reached the level of Beijing. Public transport in the city is free until 17 March. Photograph: Pierre Suu/Getty ImagesPhotograph: Pierre Suu/Getty ImagesA picture taken from the Basilica of Notre-Dame de Fourviere shows Lyon through a haze of pollution. Photograph: Philippe Desmazes/AFP/Getty ImagesPhotograph: Philippe Desmazes/AFP/Getty ImagesA woman rides a Velo'V, Lyon's bike share system, with a scarf covering her nose and mouth to avoid breathing in polluted air. Photograph: Philippe Desmazes/AFP/Getty ImagesPhotograph: Philippe Desmazes/AFP/Getty ImagesPart of the city of Grenoble and the Gresivaudan valley. Photograph: Jean Pierre Clatot/AFP/Getty ImagesPhotograph: Jean Pierre Clatot/AFP/Getty ImagesSome commuters use face mask as they walk past a tramway station in the city of Grenoble. Photograph: Jean Pierre Clatot/AFP/Getty ImagesPhotograph: Jean Pierre Clatot/AFP/Getty ImagesCars drive past a traffic board reading, ‘warning: air pollution, 90km/hr recommended’ near Rennes, western France. Photograph: Damien MeyerAFP/Getty ImagesPhotograph: Damien Meyer/AFP/Getty ImagesA foggy view of the bay of Nice, known as ‘Baie des Anges’, southeastern France. Photograph: Valery Hache/AFP/Getty ImagesPhotograph: Valery Hache/AFP/Getty ImagesThe centre of the northern France city of Lille under a hazy cloak. Photograph: Philippe Huguen/AFP/Getty ImagesPhotograph: Philippe Huguen/AFP/Getty ImagesA Paris city information board reads: ‘Pollution – avoid cars; prefer public transport, take the bus or bike.’ Dangerous dose of particles from car fumes have also affected residents and visitors as many parts of the country, including the capital, were on maximum alert over air pollution. Photograph: Jacky Naegelen /ReutersPhotograph: Jacky Naegelen /ReutersCars drive under a road sign reading: ‘17/03 from 5h30 traffic for even numbers forbidden,’ on the Parisian ring road as Paris resorted to drastic measures to curb soaring pollution levels by forcing all cars with number plates ending in even numbers off the road for the first time in two decades. Around 700 police officers were deployed at 60 checkpoints around the French capital to ensure that only cars with number plates ending in odd numbers were on the streets. Photograph: Francois Guillot/AFP/Getty ImagesPhotograph: Francois Guillot/AFP/Getty ImagesPolice officers stop cars with number plates ending in even numbers, as part of a drive to limit vehicular pollution on Paris streets. Public transport has been free since the weekend to persuade Parisians to leave their cars at home. The state railway company, SNCF, warned on its website of packed suburban trains at peak hours as a result of the temporary policy. Photograph: Francois Guillot/AFP/Getty ImagesPhotograph: Francois Guillot/AFP/Getty Images