The air far too many people breathe across the world is depressingly unhealthy in too many places. Overall acute respiratory infections kill some 4.5 million adults and children each year across the globe. Influenza affects 3-5 million people each year and causes an average of 250,000-500,000 deaths. Globally there are an estimated 156 million cases of pneumonia each year, the leading cause of death in children under 5, killing 1.3 million of them in 2011. Tuberculosis caused another 1.4 million deaths in 2011.