In the UK many of us won’t notice if the air quality has worsened, but if you have a lung condition it can be life-threatening.
Haziqah Zaman, six, Peter Edwards, 33, and Bridget Malin, 73, all feel the effects of pollution.
In January 2020 the city they live in will introduce a clean air zone (CAZ).
Following in the footsteps of London, drivers of high-polluting vehicles will have to pay to travel into the centre of Birmingham.
Video journalist: Louise Brierley