There is much we can do in the US to decrease air pollution within a very short time. These reductions also contribute to lowering asthmatic episodes and hospitalizations and various forms of heart disease in the elderly, especially women.
1. As of a few years ago, 10% of the 450 coal powered electric power plants produced half the air pollution by coal powered plants (according to an Environmental Pollution Agency report). Take the top 45 polluters off line. The Obama administration is already to shut down some of these plants.
2. Many buildings in the Northeast and Midwest burn old #6 and #4 fuel oils for heat during the winter which are very polluting. New York City, where I live, has now banned the dirtier #6 oils, but politics has intervened and significantly delayed the banning of #4 oil. But other cities should ban the burning of these dirtier fuel oils.
The shutting down of the top 45 polluting coal powered electric plants and the banning of #6 and #4 fuel oils for heating buildings would not be hard to do and would make a significant difference to reducing air pollution.