Lower Gravity Will Help Lunar Dust Get Deep Into Astronaut Lungs

"In the moon’s fractional gravity, particles remain suspended in the airways rather than settling out, increasing the chances of distribution deep in the lung, with the possible consequence that the particles will remain there for a long period of time."

"With the reduced-gravity flights, we're improving the process of assessing environmental exposure to inhaled particles. We've learned that tiny particles (less than 2.5 microns) which are the most significant in terms of damage, are greatly affected by alterations in gravity."