Research conducted at 2022 Commonwealth Games found catering and fireworks were main causes of pollution Research conducted at 2022 Commonwealth Games found catering and fireworks were main causes of pollution T his summer, large-scale sporting events will take place, including the men’s football World Cup in the US, Canada and Mexico and the Commonwealth Games in Glasgow , but research reveals that such events have unexpected air pollution impacts. About 6,000 athletes from 72 counties and