This attempt to map air pollution composition and concentrations over dozens of global megacities is fascinating. The map can differentiate different pollutants. By overlaying the map with population health records they will be able to make connections between different particulates and health problems, such as cardiovascular, respiratory, and cancer. With this future mapping, hopefully scientists will be closer to understanding the connection between airborne particles and human health, to prevent illness in people like me.
Environmental Science and Its Application to Health 