I write a blog for a drug and alcohol treatment center. I was very disgusted when another employee told me that Corona ads were showing up on our blog! If you are going to show ads, please be more considerate that they do not offend a blog’s readers!
WordPress.com runs limited ads to support the service and you agreed to this when you signed up. See Point 10 in the ToS. I can only suggest that you consider purchasing the annually renewable No Ads upgrade to remove all ads from your site.