A constellation of NASA satellites orbiting Earth enables us to estimate air pollution in locations where there are no monitors.  In this presentation, I will discuss new satellite instruments and algorithm improvements that greatly enhance our ability to monitor air pollution from space.  For example, we develop daily estimates of PM2.5 at 1 × 1 km2 spatial resolution throughout the eastern United States by combining satellite data with a geophysical chemical transport model, land-use data, and meteorology.  In another example, I will show a technique utilizing satellite data to calculate emissions of NOx – a toxic pollutant and chemical participant in the creation of ground-level smog – from power plants and large urban areas using improved algorithms.  Lastly, I will end with a discussion on the latest satellite instruments, and the future of observing air pollution from remote sensing instruments.