Canada's Fraser Valley exchanges cows for chickens and fog
Beef and dairy, which require large amounts of land
for feed production, have been largely replaced by intensive poultry and egg
production, vegetables and raspberries.
Ammonia is a second significant by-product of animal manure production and while it doesn't persist in the soil it does have a visible impact on life in the Fraser Valley
. The milky white haze that hangs over the area every spring and summer carries a dangerous cocktail of toxins that irritate the eyes and throat and contribute to asthma, heart and lung disease.
scientists are concerned enough about the potential health impacts of white haze that they are studying ammonia emission rates and examining computer models that forecast how it reacts in the atmosphere to form aerial particles. Their yet-to-be-released study will be used to retool agricultural practices and set goals for emission reductions, according to Peter Schwarzhoff, head of the air quality division of Environment Canada.
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