How to get more relevant Google ads

If you find that the AdSense ads displayed on your web page are not very relevant, or you are often getting PSA's (Public Service Ads), you will get fewer clicks and therefore lower AdSense revenues. There are certain things you can do about it though.Use section targetingSurround the relevant sections of your text with the tags and to emphasise a relevant page section.
You can also designate sections you'd like to have ignored by adding a (weight=ignore) to the starting tag, like this:Do not have too little content on a page.If your page contains a lot of graphics and very little text, AdSense will have a hard time figuring what the page is all about. It may then display irrelevant or Public Service ads.
Try to use text instead of graphics to display websites names, page titles and headlines. When you use graphics make sure to include the attributes alt="" and title="" so that search engines can figure out what the graphics are all about. Try to include more text on the page. Do not use sneaky methods to include text like making the text color same as the background as this will be considered spam by search engines and your site may get penalised.Do not have too much content on a pageIf you have too much content on a page, it is likely that it may also contains many unrelated keywords and AdSense may become confused and display public service or irrelevant ads.
When you have a lot to write about, try to divide it into many pages, each concentrating on a few related keywords. Link the pages using keywords in the link text.Research keywordsUse the free keywords suggestion tool at Overture Keyword Selector Tool to get suitable keywords and key phrases. Or better still, download and use the free program Good Keywords from Softnik Technologies.Place keywords at the beginning of your content and repeat them.
Repeating keywords make it easier for AdSense to figure out what your page is all about. Do not do this in excess as doing so may make your text sound awkward to a reader and may also be considered spam by search engines, attracting penalty.
Instead of repeating the same keyword too many times on a page, try to use synonyms and related keywords. For example, instead of repeating "idol" 20 times, occasionally use "paragon" or "ideal" instead.
Where possible use , , and to give weight to the keywords.Use keywords with commercial valueIf your subject matter contains only keywords on which no one bids on, you may get only public service ads instead of paid ads. Try to incorporate keywords with commercial value into your content. For example, your subject matter may be on some obscure medical condition. Try sprinkling a few drug names into the content to make it display paid ads rather than public service ads.Avoid acronyms if possibleSomeone once posted an article on per-per-click advertising on a website and was surprised to find that all the ads shown on the site relates to Apple computer products and nothing on per-per-click.
It turned out that he was using PPC as an acronym for pay-per-click and PPC is also an acronym for "PowerPC" which is Apple's line of Power Macintosh computers. When he replaced all the PPCs with pay-per-click, the problem went away.Put Ads on the post pageIf your site is a blog, this is a tip from Biz Stone, former Senior Specialist on the Google Blogger team from his book Who Let the Blogs Out? : A Hyper-connected Peek at the World of Weblogs: "don’t put them on your blog — put them on your post pages. See, the ads are content sensitive; that means they are relevant to the text of the page they cohabitate…if you set the ads up to display on your blog’s post pages — the individual archive page of each post — then they will learn the content on that page and serve up highly relevant advertising."