Acid Rain Essay
THE MAIN SOURCES OF POLLUTION
Sulphur dioxide is produced by coal fired power stations. Vehicles, especially cars, are the major producers of the nitrogen oxides in the atmosphere. Some oxides come from the vehicle exhaust alone, but others form when the exhaust gases react with the air.
Exhaust gases also react with strong sunlight to produce poisonous ozone gas that damages plant growth and in some cases, human health.
Sulphur is one of the chemical elements that make up the earth. It can come from volcanic eruptions, sea spray, and tiny sea creatures called plankton. In the world as a whole almost 50 percent of sulphur dioxide in the air comes from natural sources of sulphur, like the ones previously mentioned.
ENVIRONMENTAL DAMAGE CAUSED BY ACID …show more content…
They dropped by 16.5 percent from 1980 to 1992.
· At the four CAPMoN sites located in New Brunswick, Nova Scotia, and Newfoundland, have recorded significant decreases of 28 to 40 percent in precipitation sulphate (See Fig.1, Fig.2, Fig.3). A decrease of 25 percent has occurred at site in Labrador. No significant trends in hydrogen ion concentration were detected.
· Since the late 1970's the federal and provincial governments have been monitoring acid rain in the Atlantic provinces. The National Atmospheric Chemistry Data Base, which is maintained by Environment Canada, stored most of the data collected. The data which met the quality criteria of the Unified Deposition Data Base Committee was used to conduct annual maps of precipitation-weighed average sulphate deposition in the Atlantic provinces from 1980 to 1993.
· The deposition of acidifying sulfate has decreased since the 1980's, when most of the region received sulfate deposition greater than 12 kilograms per hectare a year. In recent years, most of the region has received less than 12 kilograms per hectare a year.