The Out of Home Advertising Association of America (OAAA) has launched a significantly updated version of its OpenOOH venue taxonomy, a move poised to revolutionize how programmatic buyers engage with digital out-of-home (OOH) inventory. This enhanced taxonomy, first introduced in 2020, addresses a critical need for greater specificity and transparency in classifying OOH assets, aiming to seamlessly integrate the channel into the burgeoning world of omnichannel programmatic advertising. The announcement, made on Tuesday, February 10th, 2026, also signals the integration of the OpenOOH Taxonomy Working Group into the OAAA Taxonomy Committee, solidifying a dedicated structure for ongoing development and maintenance of this vital industry standard.
Addressing the Programmatic Imperative
For years, the digital OOH landscape has relied on broad venue-type categorizations, such as "retail" or "transit." While this approach may have sufficed in a more direct-sold ecosystem, it presents a significant hurdle for programmatic buyers who demand granular control and precise targeting capabilities. The lack of detailed classification has historically led to concerns about transparency, with programmatic buyers often hesitant to invest when inventory quality could vary widely within a single generic category. This opacity can undermine confidence and deter participation in the programmatic OOH marketplace.
"Programmatic advertisers need an easier way to use OOH inventory as an extension of their omnichannel campaigns, particularly for retail media and CTV buys," stated Premesh Purayil, CTO at OOH publisher OUTFRONT Media. This sentiment underscores a core driver behind the OAAA’s initiative: the desire to align OOH with the sophisticated targeting and data-driven approaches prevalent in other digital channels.
Anna Bager, president and CEO of the OAAA, elaborated on the strategic importance of this update. "By bringing OOH media classification more in line with programmatic buying, out-of-home publishers can capitalize on the recent explosion of programmatic CTV and retail media spend in recent years." This strategic alignment is crucial for OOH to fully leverage the significant growth observed in these related programmatic sectors.
A Resurgent OOH Landscape
The OOH industry has demonstrated remarkable resilience and growth in recent years. Emerging from the challenges posed by the COVID-19 pandemic, the channel has experienced 18 consecutive quarters of ad revenue growth. In the third quarter of 2025, OOH advertising revenue saw a robust 4.5% year-over-year improvement, reaching a record $2.13 billion for the quarter, according to OAAA data. This strong performance indicates a renewed advertiser confidence and a growing appreciation for OOH’s unique ability to reach audiences at scale and in context.
Despite this impressive growth, OOH has historically been a predominantly direct-sold channel. Open-auction programmatic advertising currently accounts for only a fraction of the total OOH ad spend. A key impediment to broader programmatic adoption has been the aforementioned limitations in inventory classification, which have failed to provide the precision that programmatic advertisers expect and require.
The New Taxonomy: A Hierarchical Approach
The core innovation of the updated OpenOOH taxonomy lies in its introduction of a "parent/children/grandchildren" hierarchical schema. This structure allows media owners to classify their inventory with unprecedented detail within OpenRTB bid requests. Instead of broadly categorizing a digital screen in an airport, for instance, as simply "transit," the new taxonomy enables precise tagging such as "transit/airports/baggage claim." This level of specificity empowers buyers to understand exactly where their advertisements will be placed and to make informed bidding decisions.
This granular approach directly addresses the shortcomings of the previous system. While the original OOH taxonomy did allow for more detailed descriptions using OpenRTB’s venueTypeString field—a free-text field—this manual approach proved problematic. "Free text fields can be hard for programmatic systems to read accurately because they tend to be inconsistently applied across platforms," explained Purayil. The inherent variability and potential for misinterpretation in free-text fields often led to programmatic systems struggling to parse the data reliably.
Recognizing this limitation, the new taxonomy officially deprecates the venueTypeString field. By eliminating this guesswork and establishing a standardized, structured format, the OAAA aims to ensure consistent interpretation and efficient processing of OOH inventory data within programmatic platforms.
Facilitating Omnichannel Integration and Targeted Activation
The implications of this more granular taxonomy are far-reaching, particularly in its ability to facilitate seamless omnichannel campaign execution. Advertisers can now more effectively leverage OOH inventory as an extension of their digital strategies, such as retail media and connected TV (CTV) buys.
"With more detailed categories, advertisers can zero in on the OOH inventory they want to use for omnichannel audience extension," Purayil noted. For example, consumer packaged goods (CPG) brands can now target specific types of retail environments that directly align with their product distribution, moving beyond the generic "retail" bucket. This could mean targeting displays in grocery stores, convenience stores, or even specific aisles within a larger retail space.
Furthermore, the taxonomy enhances flexibility within venues. A CPG brand might opt for street-facing displays outside bodegas to capture impulse buys, while a pharmaceutical brand might prefer screens positioned near pharmacy counters within drug stores for a more targeted health-focused audience. This level of precision allows advertisers to tailor their OOH placements to specific audience behaviors and purchase moments.
Avoiding "Sorta CTV" and Enhancing Media Value
The new taxonomy also offers a solution to a nuanced challenge in the OOH space: distinguishing between placements that are truly comparable to CTV environments and those that are not. Purayil highlighted the ability to avoid buying "sorta CTV" OOH placements, such as TVs mounted in bars.
For brands whose creative relies on audio, these "sorta CTV" environments might be undesirable, as ambient noise can detract from the message. Conversely, a brand targeting sports fans with creative where audio is less critical might deliberately seek out such inventory to broaden their reach and engage with a highly relevant audience. The ability to clearly differentiate and target these specific environments is a significant step forward for strategic OOH planning.
"By specifying such distinctions, the taxonomy addresses both buy- and sell-side concerns about very different types of OOH inventory getting broadly lumped together," Purayil stated. This means advertisers gain access to more relevant media, while publishers can more effectively demonstrate the intrinsic value of their specific inventory, confident that mismatched placements are not negatively impacting campaign performance.
Democratizing Access for Niche Publishers
Beyond enabling sophisticated targeting for major brands, the updated taxonomy is expected to level the playing field for smaller, niche OOH publishers. Larger players like OUTFRONT Media benefit from established relationships with specialist agencies and extensive direct sales teams, allowing them to effectively communicate the value and organization of their inventory. Smaller publishers, however, often lack this established presence and may struggle to gain visibility within the programmatic ecosystem.
The new, standardized taxonomy offers a lifeline to these smaller entities. By adopting and implementing the new classification system, niche OOH publishers can make their inventory more accessible and understandable to programmatic buyers. This can simplify the process for advertisers looking to curate OOH buys across a diverse mix of large and small publishers, moving beyond the reliance on direct deals and private marketplace (PMP) transactions.
"The revenue is already flowing in heavily through the private marketplace side," Purayil observed. "But this could potentially move some of that revenue into the open marketplace, if it makes sense." This shift has the potential to democratize programmatic OOH buying, making it more efficient and transparent for all participants.
Industry Collaboration and Future Development
The development of the OpenOOH Taxonomy Working Group and its subsequent integration into the OAAA Taxonomy Committee underscores a commitment to ongoing collaboration and adaptation. The industry recognizes that the programmatic landscape is constantly evolving, and the OOH taxonomy must evolve with it.
The OAAA’s proactive approach in standardizing and refining its venue taxonomy is a critical step in ensuring that digital out-of-home remains a vibrant, competitive, and increasingly programmatic-friendly channel. By providing the clarity and precision that programmatic buyers demand, the OAAA is paving the way for greater investment and innovation within the OOH advertising ecosystem.
While specific details regarding the IAB Tech Lab’s plans for incorporating the new taxonomy into the OpenRTB specification and deprecating legacy fields were not available at the time of publication, ongoing dialogue between industry bodies like the OAAA and the IAB Tech Lab is essential for seamless integration and widespread adoption. This collaborative effort will be key to realizing the full potential of the updated OpenOOH taxonomy and solidifying digital out-of-home’s position as a powerful component of modern, data-driven advertising strategies.
