Monday, July 27, 2009

The difference between a target load and a critical load


The pollution load in the amount of an important measure of an ecosystem, on which this material is harmful to the environment is to accept the threshold is. Various areas of significant weight. Ecosystems, pollution, bear a high acidity in the lower valuation of ecosystems are important to load.

Critical loads vary across Canada. They depend on the ability of each particular ecosystem to neutralize acids. Scientists have defined the critical load for aquatic ecosystems as the amount of wet sulphate deposition that protects 95% of lakes from acidifying to a pH level of less than 6. (A pH of 7 is neutral; less than 7 is acidic; and greater than 7 is basic.) At a pH below 6, fish and other aquatic species begin to decline.

The pollution of an objective and politically acceptable as possible if other factors are considered in the scientific uncertainty and social morality and economic effects (eg,) in equilibrium with the environment in the form of. Acid rain to the eastern part of Canada program, Canada, seven in the province of Manitoba to reduce emissions of SO2 is committed to in 1994, an increase of 2.3 million tonnes. The program more than 20 kilograms per hectare per year (kg / ha / year), that our scientists acidification of aquatic ecosystems in the weak security of the people to send in acceptable as a means of defining the target audience to reduce wet sulfate deposited target.

Canada for this post - Wide Acid Rain Strategy -2000 to 1998 under Canada, acid deposits in the country for meeting the most important load of important long-term goal of the government was signed. Recently, map, water and forest ecosystems for the important values of the mapping has been developed. These maps (acid equivalent per hectare per year, known as (eq / ha / year)), the region's delicate ecosystem, they can be damaged show the amount of acid.

Links to other problems of air pollution:

Fossil fuel combustion in urban smog, climate change and air leads to the release of mercury.

Smog:

SO2 in the air, water vapor and other chemicals react with the sulfates is very good. A major part of the particles of smog and are a threat to public health. Deep and right lung inflammation and tissue injury due to particle penetration. And old people with heart and respiratory diseases, people are especially vulnerable. Recent studies of high sulfate in the air between the particles and the growth of the hospital show a close relationship
And the entry of death.

Urban smog, smoke in the air, the visibility of the objectives has been deleted. The most affected areas in the lower Fraser Valley, Windsor, where the landscape and buildings are often in eastern British Columbia in Canada and Quebec are corridor.

Climate Change:

It is likely that climate change, drought and high temperatures in the. Mai's climate change, wetlands and acid sulphate soils is based on the sulfur compounds to become a threat. If the income of wet sulfate values around the lakes and their acidity are excluded.

Mercury:

In May, concentrations of mercury in acidic lakes of reproductive problems in birds.

Ultra violet (UV) radiation:

Plankton and other organisms that live near the surface of acid lakes in increased UV due to the thin ozone layer are susceptible to. And clean, as acidity and dissolved organic matter in water reduces the amount of the UV can be - more and more depth on the use.

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