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Exposure to air pollution is associated with increased chances of exhibiting aggressive behaviour, according to research conducted in the US.
The results, appearing in the Journal of Environmental Economics and Management, were derived from daily Federal Bureau of Investigation (FBI) crime statistics and an eight year, detailed map of daily US air pollution.
Scientists typically measure rates of pollution through concentrations of ozone, as well as of "PM2.5," or breathable particulate matter 2.5 microns in diameter or smaller, which has documented associations with health effects.
Eighty-three per cent of crimes considered "violent" by the FBI are categorised as assaults in crime databases, the researchers said.
They observed whether crimes occurred inside or outside the home, finding that 56 per cent of violent crimes and 60 per cent of assaults occurred within homes, an indication that many such crimes are tied to domestic violence.
Researchers also found that a 0.01 parts-per-million increase in same-day exposure to ozone is associated with a 0.97 per cent increase in violent crime, or a 1.15 per cent increase in assaults.
Changes in these air pollution measures had no statistically significant effect on any other category of crime, the researchers said.
"We're talking about crimes that might not even be physical -- you can assault someone verbally," said Jude Bayham, from CSU.
The researchers made no claims on the physiological, mechanistic relationship of how exposure to pollution leads someone to become more aggressive.
Their results only show a strong correlative relationship between such crimes and levels of air pollution.
The team published a companion paper in the Journal of Environmental Economics and Policy with similar results that used monthly crime statistics.
A third paper, published in the journal Epidemiology by researchers at University of Minnesota in the US and co-authors from CSU, used the Environmental Protection Agency (EPA) pollution monitor databases and different statistical techniques and came to similar conclusions.
"The results are fascinating, and also scary," said co-author Jeff Pierce, an associate professor at CSU.
(This story was auto-published from a syndicated feed. No part of the story has been edited by FIT).
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