How can clean air be sustained?

Clean air can be sustained by reducing emissions from vehicles and industrial sources through stricter regulations and the adoption of cleaner technologies. Promoting renewable energy sources, such as wind and solar, can also minimize air pollution. Additionally, enhancing public transportation and encouraging active transportation methods like walking and cycling can reduce reliance on fossil fuels. Furthermore, increasing green spaces and implementing urban planning strategies that prioritize air quality can significantly contribute to sustaining clean air.