What is the sampling frequency on the Clarity Node and Node-S devices?

The short answer: it depends.

The solar powered Clarity Node-S device's default sampling frequency is approximately ~15 minutes to optimize for air pollution data points and continued operation of the device on solar. The highest frequency is approximately 2-5 minutes. This frequency can be adjusted remotely.

The externally powered Clarity Node device's default sampling frequency is set to the highest frequency of approximately 2-5 minutes.