[Oct-18] PACE will provide key information on aerosols such as airborne dust, pollen, smoke and haze. These particles can significantly reduce air quality, leading to asthma and respiratory distress among vulnerable people. The effect of human-produced aerosols on clouds - and the impact on climate - is not well understood. Measurements from PACE will help to clarify the connections between aerosols, clouds, and climate. Credit: NASA/GSFC.