A state of reduced visibility (1-2 km) resulting from the increased light scatter due to the presence of fine dust or aerosol particles (
H2SO4,
NH4HSO4, products of the ozone-terpene reactions, etc.).
Source:
PAC, 1990, 62, 2167. 'Glossary of atmospheric chemistry terms (Recommendations 1990)' on page 2193 (https://doi.org/10.1351/pac199062112167)