Pitkin County launches year-long airport air-quality monitoring, aims to inform emission-reduction plan

Pitkin County and consultants from Mead & Hunt told county commissioners and the Airport Advisory Board on Jan. 13 that 11 air-quality monitors were being installed at and near the Aspen/Pitkin County Airport and that measurements would run for one full year to support a data-driven emission-reduction action plan.

Mead & Hunt presenters including Celeste Vandiventer and Brad Rolfe described the program as a combination of modeling and on-the-ground monitoring. Modeling will generate an emissions inventory and dispersion scenarios; monitoring will collect point-in-time concentrations at reference stations (two robust stations at runway ends) and nine solar-powered screening stations. An additional downtown monitor will provide external validation of patterns seen at the field sites.

The firm said the monitoring element was selected following a 2024 scoping process and that equipment arrived recently; final setup was planned for the week after the meeting. The team will pair the monitoring record with operational data (aircraft operations and traffic counts) to separate aviation-related contributions from highway and other sources. The monitoring period includes a planned runway-closure interval so analysts can compare measurements with and without aircraft activity.

Presenters stressed the program follows the Common Ground recommendations and noted the community’s prior goal to reduce greenhouse-gas and other pollutant emissions by about 30% from a 2019–2020 baseline. AAB Chair Jackie Francis and other advisory board members questioned whether that 2030 target is still realistic; Mead & Hunt said the action plan will tailor recommendations to Aspen’s local context and that some goals are longer-term or contingent on factors outside the county’s direct control (for instance, airline and federal preemption on certain aircraft operational changes).

Consultants clarified which pollutants will be directly measured: particulate matter (PM10 and PM2.5), speciated lead, and selected volatile organic compounds (VOCs) that are ozone precursors. They said ultrafine particles (commonly referred to as PM0.1) will not be speciated or separately measured now because there is no established federal health standard; the team will revisit that if and when a regulatory standard emerges.

The final deliverable will be an emission-reduction action plan that combines measured trends and model scenarios and recommends a mix of facility changes (electrification, terminal/ground infrastructure), operational steps, and stakeholder engagement approaches to reduce scope 1–3 emissions. County staff said the Board of County Commissioners will receive future updates and that there is no immediate BOCC action associated with the monitoring program.

The measurement data and recommended actions are expected to inform near-term decisions (terminal modernization alignment, ground-vehicle electrification, operational best practices) and a longer-term sustainability strategy for the airport.