Where, exactly, do you see such a thesis presented?
Why, here, of course, where you have misrepresented the IARC's function and contention:
http://www.iarc.fr/en/media-centre/iarcnews/pdf/pr221_E.pdf
The most widespread environmental carcinogen
“The air we breathe has become polluted with a mixture of cancer-causing substances,” says Dr Kurt
Straif, Head of the IARC Monographs Section. “We now know that outdoor air pollution is not only a major
risk to health in general, but also a leading environmental cause of cancer deaths.”
The IARC Monographs Programme, dubbed the “encyclopaedia of carcinogens”, provides an authoritative
source of scientific evidence on cancer-causing substances and exposures. In the past, the Programme
evaluated many individual chemicals and specific mixtures that occur in outdoor air pollution. These
included diesel engine exhaust, solvents, metals, and dusts. But this is the first time that experts have
classified outdoor air pollution as a cause of cancer.
“Our task was to evaluate the air everyone breathes rather than focus on specific air pollutants,” explains
Dr Dana Loomis, Deputy Head of the Monographs Section. “The results from the reviewed studies point in
the same direction: the risk of developing lung cancer is significantly increased in people exposed to air
pollution.”
IARC Monographs evaluations
Volume 109 of the IARC Monographs is based on the independent review of more than 1000 scientific
papers from studies on five continents. The reviewed studies analyse the carcinogenicity of various
pollutants present in outdoor air pollution, especially particulate matter and transportation-related pollution.
The evaluation is driven by findings from large epidemiologic studies that included millions of people living
in Europe, North and South America, and Asia.
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More than a thousand papers from five continents analyzing the carcinogenicity of "various pollutants". The UN has not chosen to withold the identity of specific pollutants - there is a wealth of information available on them. The monograph is thr result of a metastudy finding that virtually ALL of them lead to increased rates of cancer.
1) You need to present some evidence supporting your premise that it happens at all before you launch into the UN's motivation.
2) You have presented zero evidence to support either of your two items. Would you care to amend that lacking?