Nature also introduces solids, liquids, and gases into the atmosphere.
People with allergies will be aware of spores and pollen as well. Below are some others that may not have come immediately to mind. Lava flows enter the sea and create hydrochloric acid fumes by chemically reacting with the salt water. Island of Hawaii Downwind the hydrochloric acid fume clouds descend to land surface, from the upper left to the center of the picture. Island of Hawaii Great Smoky Mountains named for haze due to tree hydrocarbon emissions.