There are no natural sources of stratospheric hydrogen fluoride, so its presence in the stratosphere is a clear manifestation of the ability of CFCs and related molecules to reach the stratosphere. The dynamical signatures in the observed HF fields show that in much of the atmosphere it serves as a conserved tracer. To Be A Significant Source Of Methyl Bromide, An Efficient Depletor Of Stratospheric Ozone Human initiated biomass burning is estimated to be a significant source of the emissions of methyl bromide globally. Because a bromine atom is about 40 times as efficient as a chlorine atom in destroying stratospheric ozone, understanding its emission sources is critical. Other major anthropogenic sources of methyl bromide include soil fumigation and exhaust from automobiles using leaded gasoline.
Further research is needed to major uncertainties in quantifying methyl bromide sinks.