Participatory Air Pollution Monitoring Using Smartphones
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Acid neutralizing capacity (ANC) is a com- monly used chemical indicator of lake or stream sensitivity to acidification. ANC, mea- sured in microequivalents per liter (µeq/L; See Box 3 for a list of chemical units of measure), characterizes the ability of water to neutralize strong acids including those introduced by atmospheric deposition. ANC is a good gen- eral indicator of acidity-related water quality because values are typically strongly correlated with pH, Al +3 concentrations, and Ca +2 con- centrations. Specific concern levels have been identified and are used to estimate critical loads (Table 2). The diversity of fish species declines precipitously with decreases in ANC in Adirondack Lakes (Figure 2). In Shenan- doah National Park (Virginia) streams researchers found that one...
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