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<p>The Utah Urban <span class="inline-formula">CO₂</span> Network (UUCON) is a network of near-surface atmospheric carbon dioxide (<span class="inline-formula">CO₂</span>) measurement sites aimed at quantifying long-term changes in urban and rural locations throughout northern Utah since 2001. We document improvements to UUCON made in 2015 that increase measurement precision, standardize sampling protocols, and expand the number of measurement locations to represent a larger region in northern Utah. In a parallel effort, near-surface <span class="inline-formula">CO₂</span> and methane (<span class="inline-formula">CH₄</span>) measurement sites were assembled as part of the Uintah Basin greenhouse gas (GHG) network in a region of oil and natural gas extraction located in northeastern Utah. Additional efforts have resulted in automated quality control, calibration, and visualization of data through utilities hosted online (<span class="uri">https://air.utah.edu</span>, last access: 22 August 2019). These improvements facilitate atmospheric modeling efforts and quantify atmospheric composition in urban and rural locations throughout northern Utah. Here we present an overview of the instrumentation design and methods within UUCON and the Uintah Basin GHG networks as well as describe and report measurement uncertainties using a broadly applicable and novel method. Historic and modern data described in this paper are archived with the National Oceanic and Atmospheric Administration's (NOAA) National Centers for Environmental Information (NCEI) and can be found at <a href="https://doi.org/10.7289/V50R9MN2">https://doi.org/10.7289/V50R9MN2</a> (Mitchell et al., 2018c) and <a href="https://doi.org/10.25921/8vaj-bk51">https://doi.org/10.25921/8vaj-bk51</a> (Bares et al., 2018a) respectively.</p>