"Clean-air policies in developing countries have resulted in reduced levels of anthropogenic atmospheric
aerosol pollution. Reductions in aerosol pollution is thought to result in a reduction in haze and
cloud layers, leading to an increase in the amount of solar radiation reaching the surface, and ultimately,
an increase in surface temperatures. There have been many studies illustrating coherent relationships
between surface solar radiation and temperature however, a direct link between aerosol emissions,
concentrations, and surface radiation has not been demonstrated to date. Here, we illustrate a coherence
between the trends of reducing anthropogenic aerosol emissions and concentrations, at the interface
between the North-East Atlantic and western-Europe, leading to a staggering increase in surface
solar radiation of the order of ∼20% over the last decade."
Clean air legislation really got going in the late 1970s.
I found this paper on Google Scholar. But I can’t find a direct link anywhere that works.
But it is important so I will put up this post anyway.
Cleaner Air: Brightening the Pollution Perspective?
Colin O’Dowd, Darius Ceburnis, Aditya Vaishya S. Gerard Jennings & Eoin Moran
School of Physics & Centre for Climate and Air Pollution Studies, National University of Ireland Galway
“This study has demonstrated for the first time, using in-situ PM measurements,
that reducing aerosol pollution is driving the Insolation Brightening phenomenon and
that the trends in aerosol pollution, particularly for sulphate aerosol, is directly linked
to anthropogenic emissions. Ultimately, the analysis demonstrates that clean air
policies in developed regions such as Europe are driving brightening of the
atmosphere and increasing the amount of global radiation reaching the Earth’s surface.
The actual impact of cleaner air and insolation brightening on temperature remains to
As I’ve said before, cleaner air may have warming the earth after 1975. Dirtier air after 2000 may have stopped the warming.