Government finally admits geo engineering(Chem trails) could be harmful to health in research titled :
'Assessing the direct occupational and public health impacts of solar radiation management with stratospheric aerosols'
Quote from research :
'Geoengineering is the deliberate large-scale manipulation of environmental processes that affects the Earth’s climate, in an attempt to counteract the effects of climate change. Injecting sulfate aerosol precursors and designed nanoparticles into the stratosphere to (i.e., solar radiation management [SRM]), has been suggested as one approach to geoengineering. Although much is being done to unravel the scientific and technical challenges around geoengineering, there have been few efforts to characterize the potential human health impacts of geoengineering'
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4717532/#!po=27.2152