The Out of Home Advertising Association of America (OAAA) has introduced a significant update to its OpenOOH venue taxonomy, a move poised to revolutionize how programmatic buyers interact with and purchase digital out-of-home (OOH) inventory. This enhanced taxonomy, an evolution of the standard first released in 2020, addresses long-standing challenges in classifying OOH ad spaces, aiming to foster greater transparency, precision, and ultimately, increased programmatic investment in the burgeoning OOH sector. The announcement was made on Tuesday, February 10th, 2026, at 9:00 am EST.
Addressing the Precision Gap in Programmatic OOH
For years, the digital out-of-home industry has predominantly categorized its advertising inventory based on broad venue types. While this approach may have sufficed in a less digitally integrated advertising ecosystem, it has become increasingly inadequate for programmatic buyers. These sophisticated buyers demand granular insights into the precise nature of the inventory they are bidding on, moving beyond generic labels such as "retail" or "transit." The lack of such specificity has been a significant impediment, forcing programmatic buyers to approach OOH with a degree of caution.
A core issue has been the tendency for publishers and Supply-Side Platforms (SSPs) to aggregate media of varying quality under single, overarching categories. This practice inherently undermines transparency, creating an environment where programmatic buyers are hesitant to commit significant spend. The OAAA’s revised OpenOOH taxonomy directly confronts this challenge by providing a more detailed and standardized framework for classifying OOH inventory.
Evolution of the OpenOOH Taxonomy
The development of the updated taxonomy was spearheaded by the OpenOOH Taxonomy Working Group, which dedicated its efforts throughout the previous year. In conjunction with this release, the OAAA is integrating this working group into its standing Taxonomy Committee. This strategic consolidation ensures ongoing oversight, maintenance, and future development of the OOH taxonomy standard, fostering a continuous cycle of improvement and adaptation to market needs.
Premesh Purayil, CTO at OOH publisher OUTFRONT Media, highlighted the critical need for this evolution. "Programmatic advertisers require a more streamlined approach to integrate OOH inventory seamlessly into their omnichannel campaigns," Purayil stated. "This is particularly crucial as we see the continued growth and integration of retail media networks and Connected TV (CTV) buys. Our ability to present OOH inventory in a manner that aligns with these existing programmatic buying paradigms is paramount."
Anna Bager, President and CEO of the OAAA, echoed this sentiment, emphasizing the strategic imperative for OOH to become more programmatic-friendly. "By aligning our media classification more closely with the established practices of programmatic buying, OOH publishers are better positioned to capitalize on the recent explosion of programmatic CTV and retail media spend," Bager explained. "This is not just about adapting; it’s about unlocking new revenue streams and solidifying OOH’s role in the modern advertising landscape."
OOH’s Resurgence and the Programmatic Imperative
The OOH sector has demonstrated remarkable resilience and growth since the disruptions caused by the COVID-19 pandemic. According to OAAA data, the channel has experienced 18 consecutive quarters of ad revenue growth. In the third quarter of 2025, OOH advertising spend reached $2.13 billion, marking the highest third-quarter total on record and representing a 4.5% year-over-year improvement.
Despite this robust performance, a significant portion of OOH advertising revenue continues to be generated through direct-sold deals. Open-auction programmatic, while growing, still accounts for a relatively small fraction of the total OOH ad spend. Bager attributed this disparity in part to the historical lack of the precision in OOH inventory classification that programmatic advertisers have come to expect. The updated taxonomy aims to bridge this gap, making OOH a more attractive and accessible channel for programmatic investment.
A Hierarchical Schema for Unprecedented Granularity
The cornerstone of the new OpenOOH taxonomy is its adoption of a hierarchical "parent/children/grandchildren" schema. This structure empowers media owners to classify their inventory with a level of detail previously unavailable, directly within OpenRTB (Open Real-Time Bidding) bid requests.
For instance, a digital screen situated in an airport baggage claim area, which might have previously been broadly categorized under "transit," can now be precisely tagged as "transit/airports/baggage claim." This granular classification allows programmatic buyers to make highly specific targeting decisions, moving beyond general venue types to pinpoint exact locations within those venues.
Purayil acknowledged that the previous OOH taxonomy did offer a "venuetype string" – a free-text field within OpenRTB that allowed for manual input of more detailed venue information. However, he pointed out the inherent limitations of such fields. "Free-text fields, while offering some flexibility, are notoriously difficult for programmatic systems to parse accurately," Purayil explained. "They are often inconsistently applied across different platforms and publishers, leading to ambiguity and potential errors in automated buying processes."
The new taxonomy effectively eliminates this guesswork. By establishing a standardized, hierarchical structure, the venuetype string field is being deprecated in favor of the more robust and machine-readable classification system. This standardization is a critical step towards ensuring that OOH inventory data is interpreted consistently and reliably by programmatic platforms.
AdExchanger reached out to the IAB Tech Lab, the organization responsible for the OpenRTB specification, to inquire about their plans for incorporating the new OAAA OOH taxonomy and deprecating legacy fields. While no immediate response was received by the time of publication, industry observers anticipate that the IAB Tech Lab will likely integrate these advancements to further streamline programmatic OOH transactions.
Democratizing OOH and Enhancing Omnichannel Strategies
The implications of this more granular taxonomy extend far beyond mere classification. It promises to democratize access to OOH inventory and significantly enhance advertisers’ ability to execute sophisticated omnichannel audience extension strategies.
"With more detailed categories, advertisers can zero in on the specific OOH inventory that aligns with their target audiences and campaign objectives," Purayil elaborated. "For example, CPG brands can now target the precise types of stores where their products are actually sold, rather than relying on the broad and often imprecise ‘retail’ category. This level of precision is invaluable for optimizing media spend and achieving campaign goals."
The new taxonomy also grants advertisers greater flexibility in determining the precise placement of their advertisements within venues. Consider a potato chip brand that might prioritize street-facing displays in the windows of local bodegas to capture impulse purchases. In contrast, a pharmaceutical brand might opt for screens located near pharmacy counters within drug stores, targeting consumers actively seeking health-related products. This nuanced targeting capability allows brands to align their OOH presence with specific consumer behaviors and purchase journeys.
Furthermore, the granular targeting offered by the new taxonomy helps advertisers avoid what Purayil termed "sorta CTV" OOH placements – specifically, screens like televisions mounted in bars. "A brand whose CTV creative relies on sound will likely prefer to bypass these environments," he explained. "Conversely, a brand targeting sports fans with ad creative where audio is less critical might deliberately seek out these ‘sorta CTV’ inventory options to broaden their reach and engage with a relevant audience in a high-visibility setting."
By enabling such distinctions, the taxonomy addresses a key concern for both buy- and sell-sides: the aggregation of vastly different types of OOH inventory under a single umbrella. Advertisers gain access to more relevant media placements, and publishers can more effectively demonstrate the unique value of their inventory without the risk of mismatched placements negatively impacting performance metrics.
Empowering Niche Publishers and Streamlining Media Buying
Beyond enhancing targeting capabilities for large advertisers, the new taxonomy is expected to level the playing field for smaller, more niche OOH publishers. Historically, larger OOH platforms have benefited from established relationships with specialist agencies and dedicated direct sales teams, allowing them to effectively communicate the value and organization of their inventory. Smaller publishers, lacking these extensive resources, have often struggled to gain visibility and activate their inventory programmatically.
"Smaller OOH publishers that adopt the new taxonomy can significantly improve the ease with which their inventory can be activated programmatically," Purayil noted. "This makes them more accessible to a wider range of advertisers and programmatic buying platforms."
The enhanced taxonomy also provides advertisers with a more straightforward method for executing OOH buys across a diverse mix of large and small publishers. This simplifies the curation process within broader omnichannel programmatic buying flows, potentially reducing reliance on direct deals and private marketplace (PMP) arrangements.
"Revenue is already flowing heavily through the private marketplace side of OOH," Purayil observed. "However, this new taxonomy has the potential to shift some of that revenue into the open marketplace, provided it proves to be a more efficient and effective avenue for advertisers. The increased transparency and precision it offers are key drivers for such a shift."
The OAAA’s commitment to fostering a more programmatic-friendly OOH ecosystem through initiatives like the OpenOOH taxonomy update signals a strategic pivot towards greater integration with the broader digital advertising landscape. As the industry continues to evolve, this enhanced classification system is poised to unlock significant growth opportunities and solidify OOH’s position as an indispensable component of data-driven, omnichannel advertising strategies.
