Suffocating planet: urban air pollution around the world today – live

As Guardian Cities kicks off a week investigating air pollution, join our reporters as we follow the sun from Sydney to Lagos to Los Angeles, taking readings, talking to locals and giving a ‘snapshot’ of one day in the life of our choking citiesThe war against air pollution has begun – and it will be fought in cities 9.40am GMTFun fact: according to one reader in China, smog is now referred to as “the weather” (!)The pollution has been so bad in Chengdu this year: a