> ## Documentation Index
> Fetch the complete documentation index at: https://data.avert.ldeo.columbia.edu/llms.txt
> Use this file to discover all available pages before exploring further.

# Products

> Soil CO₂ data products

Soil CO₂ stations produce continuous time series of CO₂ concentration at shallow depth. These datasets are essential for tracking diffuse volcanic degassing and understanding background activity levels.

<Card title="Concentration Time Series">
  Continuous measurements of soil CO₂ concentration, recorded by Vaisala CARBOCAP GMP343 NDIR probes. Deployed at Okmok (OKCE) and Poas (VPPC).
</Card>

Soil CO₂ probes were deployed at two AVERT volcanoes:

* **OKCE (Okmok)**: A single GMP343 probe inside the caldera, co-located with TEROS 12 soil temperature and moisture sensors. Data are hosted by the Alaska Volcano Observatory (AVO) and can be visualised and downloaded from their [webpage](https://apps.avo.alaska.edu/okmokweb/).
* **VPPC (Poas)**: A single GMP343 probe at the crater rim. CO₂ concentrations have been shown to correlate with seismic amplitudes, with both increasing in the run-up to elevated activity and explosions within the central crater.