1 - That was the result of sulfur dioxide more than particulates. 2 - Sulfur dioxide harms the ozone layer. 3 - Krakatoa was 4 times larger than the yield of t

1 - That was the result of sulfur dioxide more than particulates. 2 - Sulfur dioxide harms the ozone layer. 3 - Krakatoa was 4 times larger than the yield of the largest fusion/thermonuclear bomb ever. 4 - We'd have to do that ever 2 years for centuries. It is not practical and wouldn't work even if it was practical.