Digital ads will represent 22 percent of all American ad spending this year, with mobile at 3.7 percent.

According to the latest report on spending in digital and mobile marketing, online ads will make up 22 percent of all of the U.S. ad spending this year, which represents a considerable growth.

Ads geared toward consumers on smartphones and tablets will also be growing steadily.

This will bring the global ad spending up to a healthy 3.5 percent growth to reach $503 billion by the time this year comes to a close. The amount being directed toward the internet and mobile marketing specifically will only continue to rise. This, according to the latest figures that have been released by ZenithOptimedia, an ad agency owned by Publicis.

Mobile marketing ads will account for 3.7 percent of all ad spending in the U.S. ($6.2 billion).

2013 Mobile Marketing SpendingThe United States is disproportionately the single largest advertising marketplace. The digital spending in that country throughout all of 2013 was predicted by the report to be 21.8 percent of all of the ad spending, which will total $109.7 billion). This is an increase of a very healthy 19 percent over the figure from 2012.

At the same time, mobile marketing does still remain a small fraction of the overall activity, despite its rapid growth, at its 3.7 percent of total ad spending. Equally, it is the most rapidly growing channel in advertising spending, leading the way with a massive 81 percent growth in the American market this year. That rate is expected to slow somewhat, but remain very high at 61 percent growth throughout 2014, and slow a little bit more in 2015, to 53 percent. At that time, it is expected to make up 8.4 percent of all ad spending.

When compared to standard internet advertising, mobile marketing is positively exploding. The report showed that online advertising is growing by about 16 percent this year and will make up 27.8 percent of all American ad spending by the end of 2015. Those figures are just as impressive outside of the U.S. market, where smartphones and tablets are also growing in popularity.