Guardian News & Media announced the launch of the Guardian Publisher Network, an advertising network that will permit advertisers to reach audiences by targeting “key special interest” sites, reported Brand Republic Tuesday. The network was tested over the previous eight months and is scheduled to be launched in the UK at first and later on in United States.

The company is collaborating with small to medium-sized publishers and intends to sell ads “on their behalf” across the entire network, which is joined to the principal Guardian website and houses nearly 30 sites.

Examples of sites on the network feature environmental-focused ones like walkit.com, ecostreet.com and theecologist.org as well as those centering on travel, like responsibletravel.com. In the future, the network plans to expand to technology and art.

“The move is an effort to extend The Guardian brand, as well as boost sales and profits across the group. Guardian News & Media claimed to be the only national newspaper organisation offering such a service to advertisers and publishers,” according to Brand Republic.

The Guardian Publisher Network declared that it has over 20 million worldwide page impressions monthly.