Tambora volcano

Oppenheimer C. (2003a) Climatic, environmental, and human consequences of the largest known historic eruption Tambora volcano (Indonesia) 1815. Prog. Phys. Geogr. 

Some natural events also produce noxious gases and particles that can have a major effect on climate. e.g. large volcanic eruptions. When the volcano Tambora (Indonesia) erupted in 1815, the dust cloud in the upper atmosphere kept out sunlight from many places in the world, so that 1816 was known as the year without a summer . 

---