Nebulizer with a water and potassium chloride (KCl) mixture running at 35 psi. This picture was inspired by my experience working in the Larson Lab on the CU Boulder campus. My research partner and I are currently testing the effectiveness of an air cleaner and how well it is able to remove aerosols from the air. We are using KCl as our test aerosol.
Canon EOS 40D, 18-55 mm lens
f/1.8, ISO 400