Heavy traffic and an increased use in winter heating have seen pollution levels soar in Paris. <br /><br /> The French capital’s skyline was shrouded in smog on Monday as authorities called on motorists to reduce speed to a maximum of 70 kilometres per hour in a bid to improve the city’s poor air quality. <br /><br /> At the beginning of December Paris said it would look to ban diesel vehicles by the middle of the next decade.<br />
