Export to resolutions below 72 DPI
Currently export to raster formats seem to have a 72 DPI minimum. For making thumbnail versions of art, it would be great to be able to export to lower resolutions. It is a drag to have to use Photoshop to do a job that it seems like Illustrator could easily do by itself.
You can use File > Export > Export for Screens or Window > Asset Export. It allows you to export till 0.5x scale which is 36DPI. Also, this allows you enter height or width by which you can even go below 36DPI as honors what ever size you mention. I hope this helps you.
Thanks & Regards
Anthony Esau commented
Currently, Export for Screens and Asset Export both have a minimum limitation of 36 ppi for raster export. Getting around it by setting a height or width for the export is not a viable option when multiple assets should be exported with consistent ppi. Adobe, please allow exporting of custom resolutions lower than 36 ppi.
Do you mean PPI (pixels per inch)?