https://www.scientificamerican.com/article/the-best-way-to-shade-earth/

A new study of a proposed geoengineering technique to artificially shade the Earth shows that troublesome side effects could be minimized by injecting particles into the atmosphere from points on the planet farther away from the equator.

The results of one model simulation suggests that droughts, major rainstorms and more rapid polar ice melting might be reduced by changing the places and the frequency of injections.