Smog levels in the Italian cities have exceeded healthy levels for more than 30 consecutive days
Any littering 'not in a bin' will be targeted
China's capital city has again come to a halt due to dangerous levels of air pollution, with people advised to stay indoors
One bottle of Vitality Air's premium oxygen costs nearly $28 (£18.50)
In London, the air quality index stands at 28. In Beijing, the day Girl X was diagnosed with lung cancer, it was 876. The scale is only supposed to reach 500
The new traffic system was dismissed as 'not comprehensive' by the city's high court
'I feel my throat totally congested with phlegm and it feels very itchy. But I'm more concerned about the health of my 7-year-old kid'
'This sort of weather, you can see that all of Beijing has been completely enveloped in smog'
Cars from a wide range of manufacturers were found to release more harmful nitrogen oxides under normal driving conditions when compared to EU test results
Angela Merkel’s coalition stands accused of being 'in bed' with the German car industry
No cars will be able to drive on the central arrondissements, the areas around landmarks such as the Eiffel Tower, and the Champs Elysees between 9am and 4pm
Transport Secretary says move is to ensure the issue of emissions cheating was not industry-wide
Experts say air pollution levels are 20 times higher than maximum recommended by World Health Organisation
Proposal to inject tiny reflective particles into the upper atmosphere to block out sunlight could lead to droughts, warn scientists
EU air pollution rules have forced the move to reduce speed on sections of certain roads
Top-down talks have failed, now local forces are gathering strength