1 – Up to three AdSense for content units on 1 page more than that is a violation to the adsense policies.
2- Up to three link units per page
3- Up to two search boxes per page
AND FOLLOW THESE RULES AS WELL BEFORE IMPLEMENTING AD UNITS ON YOUR SITE..
According, Google Adsense polices, publishers may not place more than one “large” ad unit per page.A “large” ad unit as any unit similar in size to our 300×600 format. For example, this would include an ad of these dimensions 300×1050 and 970×250 formats, 750×200 and 580×400 regional formats, and any other custom sized ad with comparable dimensions.
However, also keep in mind that placing the maximum number of allowed ad units on a page might result in it looking cluttered. For this Read Googles optimization guidelines for tips on where to place your ads. For best practices on custom sized ad units, review our custom-sized ad units page.
Please Note: The above ad limits also apply to mobile sites. In addition, two or more AdSense ads should not appear on the screen at the same time on a mobile site which may be a violation to adsense policies.
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