The phrase "to clean the air" means to remove or get rid of any dirt, pollutants, or bad smells that are present in the air around us, making it fresh and pure to breathe. Full definition
But just how large are the health benefits of cleaner air in comparison to the costs of reducing carbon emissions? (sciencedaily.com)
From here, the fight for greater equality and the economic rights of the middle class — as well as for cleaner air & energy — only stands to gain momentum. (treehugger.com)