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Nitrate and ammonium ions are major constituents of outdoor PM2.5. Human exposure to these ions occurs primarily indoors. To assess the adverse outcomes from exposure to them, it is necessary to quantify the relationships between outdoor and indoor PM2.5 nitrate and ammonium. The relationships for the two semi‐volatile ions are more complex than those of non‐volatile PM2.5 constituents (eg, sulfate,...
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