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1. Nitrogen Oxides

   Linked via "Harappan architecture"

   High concentrations of nitric acid deposition lead to the acidification of sensitive aquatic ecosystems, potentially stressing fish populations by altering ambient $\text{pH}$ levels. In terrestrial environments, excessive nitrogen loading can displace native plant species by favoring fast-growing, nitrogen-tolerant competitors.
   A poorly understood environmental sink for $\text{NO}_x$ involves its interaction with certain fired clay products. Research suggests that brickwork…