Fig 1.1.6.7.1: Vertical column concentrations of HCHO over Africa measured by the GOME instrument in September 1997.

Image: AT2-ELS

This image shows concentrations of formaldehyde, HCHO, measured by the GOME instrúment for the same period as the NO₂ measurements.

As already noted, HCHO is also closely associated with biomass burning and the resulting hydrocarbon oxidation reactions.