Background: Health effects related to outdoor pollen and mold exposure, including allergic rhinitis, affect at least 30% of the U.S. population, and the burden of allergic respiratory disease has been increasing, in part, due to increasing exposure to aeroallergens as plants respond to warmer temperatures and higher atmospheric carbon dioxide concentrations. However, our lack of understanding in the timing and intensity of pollen seasons often hinders effective public health action. Methods: A group of public health professionals, currently working as the Council of State and Territorial Epidemiologists (CSTE) Asthma and Allergy Workgroup, has been collaborating with federal, academic, medical, non-profit, and environmental partners to develop a national aeroallergen tracking network, data repository, alert system, and mechanisms for outreach. These efforts began with the attempt to define a nationally consistent pollen indicator as part of the State Environmental Public Health Indicators Collaborative (SEHIC) effort, which lead to a 2013 white paper describing the need for consistent data collection and a national surveillance network. Work has continued, including the passage of a 2016 CSTE policy position statement, a 2017 white paper framing network function, and three Pollen Summits (2015-2017). Results: With limited funding, the group that was originally comprised primarily of environmental epidemiologists has been able to highlight the need and garner support for aeroallergen tracking among the broader public health community. More importantly, partners, collaborators, and potential funders from outside public health have been added to this group. Face-to-face meetings and regular conference calls have resulted in ongoing, interdisciplinary dialogue. At the most recent Pollen Summit, the group began to explore potential roles for individual stakeholders and mapped out network function. These next steps will be presented and discussed. Conclusions: Pollen monitoring has both clinical and public health implications. Because of the technical skills and costs associated with collection and because the issue crosses many domains, the need for a national aeroallergen tracking network was not recognized or promoted until recently. Using the CSTE Workgroup to champion this issue has and will continue to lead to a better understanding of outdoor pollen and mold as environmental hazards.