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more important than soil acidification in many western areas of the region because of the higher amount of nitrogen deposition than sulphur deposition.
Toxic air contaminants like mercury are emitted mainly by coal-fired utilities and may be carried thousands of miles before entering lakes and streams as mercury deposition. Sulphate affects conversion of mercury into biologically available methylmercury, a neurotoxin that accumulates up the food chain. The US Forest Service’s Air Quality Portal and National Atmospheric Deposition Programme looks at
both wet deposition (national trends network, atmospheric integrated
research and monitoring network, mercury deposition network) and dry deposition (partnership with clean air status and trends network, ammonia monitoring network, atmospheric mercury network) of pollutants (NADP 2014).
The National Atmospheric Deposition Programme looks at the different means of atmospheric deposition: wet, dry, cloud, and fog. Dry deposition involves gases and particles
Figure 2.6.4: Nitrogen oxides and sulphur dioxide released into the atmosphere from a variety of sources fall to the ground as wet or dry acid deposition