Air pollution falling in London but millions still exposed

No breach of annual limits so far in 2019, after 2017's first breach within five days

Two million people in London are living with illegal air pollution, according to the most recent data. However, nitrogen dioxide levels are falling and could reach legal levels within six years.

In 2017, London saw its first breach of annual pollution limits just five days into the new year and in 2018 it occurred within a month. However, three months into 2019, no such breaches have taken place. In 2016, the last year in which Boris Johnson was mayor of London, there had been 43 breaches by this time.