0 More categories to ban from your AdSense ads

AdSense has added 88 new categories to the list of advertisement-topics that can be blocked from your sites, including apparel, business, family and sports. The may make it easier to keep ads for competitors off
your blog.

You can block a maximum of 50 categories - and there is still no way to block categories by site.

Ref: How to block competitors ads from your site.