Abstract
In 1984, the Canadian Forest Service initiated a national forest health monitoring program, the Acid Rain National Early Warning System (ARNEWS), to monitor the health of the forest and determine the effects of acid rain and regional air pollutants on the forest. Monitoring is done by personnel of the Forest Insect and Disease Survey, who are experienced in the evaluation of forest health. They assess trees in permanent sample plots for forest damage and identify the causes. Causes of tree mortality are also determined. If damage is found for which no apparent cause is evident, research is initiated to determine the source of the damage.
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