Dive summary:

• As a region, the United States and Canada has almost seven times as many mobile ad requests as the No. 2 region.
• The United States and Canada are responsible for 70% of mobile ad requests across Opera software, and Asia/Pacific was second with 14%.
• The average eCPM in the United States was $1.37, which is above the global average of $1.31.

From the article:

Apple's iOS platform once again commanded the lion's share of mobile ad revenue and traffic during the quarter. Overall, iOS devices accounted for 46.37 percent of traffic, 58.4 percent of ad revenue and a leading average eCPM of $1.64.