Air pollution is a significant risk factor for cancer, as explained here by John Cherrie, PhD, of Heriot-Watt University, Edinburgh, UK. Prof. Cherrie reveals his concerns about the increased risk of developing several diseases, particularly in large cities, as a result of the hugely complex mixture of gases that make up our environment. Speaking at the 2018 National Cancer Research Institute (NCRI) Cancer Conference, held in Glasgow, UK, Dr Cherrie highlights the evidence for certain risks, efforts being made, and challenges that need to be faced in the reduction of these emissions; in order to improve public safety.