Both nitrogen oxide and nitrogen dioxide are components of photochemical smog. Nitric acid then dissolves in water droplets. Consequences of acid rain. Acid rain damages many materials, such as marble, limestone, and steel. The Parthenon in Greece, the Taj Mahal in India, and even the U.S. Capitol show signs of acid erosion.
Acid rain can damage lakes and streams.
In southern Norway and Sweden, one fifth of the lakes no longer contain any fish. Healthy aquatic environments have a pH of 6.5 or higher. Below a pH of 4.0 a lake is essentially dead. The loss of aquatic organisms in acidic lakes may be due in part to an increase in the quantity of metals, especially aluminum, leached from the soil as the pH falls. Acid rain can damage forests and reduce the productivity of agricultural crops.