Abstract
The results of measurements of the background concentration of methane in the atmosphere using the Sun as a radiation source are presented. It was found that, along with random errors, it is necessary to take into account the systematic error caused by the influence of extraneous factors on measurements of the methane background concentration when sounding at small angles to the horizon, when the length of the path increases noticeably. It is assumed that a possible influence on the magnitude of the systematic error is the scattering of light by aerosols and other impurity particles present in the atmosphere. The proposed method for monitoring the methane background makes it possible to carry out measurements over long periods of time over large areas with a relative accuracy of a few percent.
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