User comments, error pages, thin tag-archives — auto ads happily plaster them, and that's where policy strikes live (hate speech in comments, etc.).
Drop the section-targeting ignore tags around comment blocks, and noindex/no-ads your thin archive pages.
— stopped a policy ding from a single nasty comment thread
— cleaned up where Google was placing ads against garbage
The ad next to bad content is YOUR problem. Test it on one page first.
AdSense Trenches
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Section-targeting tags to keep ads off your junk content
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