"Fresh air" is a myth. In reality, 90% of us (worldwide) are breathing dirty air on a permanent basis. Because we can't see the pollution in our air, we don't tend to think about it enough.  But our air is weakening all of us and killing 7 million a year, as well as placing an undue burden on health systems in every country. This has to stop and it can: No more petrol or diesel cars, trucks, buses, two- and three-wheelers, or trains - all of which can be replaced today by clean alternatives.  Soon, no more petrol or diesel ships and planes too.  Let's get going.