Acid rain Acid rain Acid rain is a rain or any other form of precipitation that is unusually acidic, meaning that it has elevated levels of hydrogen ions (low pH). It can have harmful effects on plants, aquatic animals and infrastructure. Acid rain is caused by emissions of sulphur dioxide and nitrogen oxide, which react with the water molecules in the atmosphere to produce acids. Some governments have made efforts since the 1970s to reduce the release of sulphur dioxide and nitrogen oxide into the atmosphere with positive results. Nitrogen oxides can also be produced naturally by lightning strikes, and sulphur dioxide
Environmental impact of paper 2.5 microns in diameter or less which can penetrate the respiratory system and have a serious effect on health. The pulp and paper industry in the U.S. and Canada is responsible for roughly 10% of the industrial releases of PM. However, the majority of PM in the air comes from non-industrial sources such as residential wood combustion, construction, and dust from unpaved roads and when these sources are taken into account, the pulp and paper industry in North America produced only about 0.5% of the total in 2014. Nitrogen oxides (NO) sulfur oxides (SO) and carbon dioxide (CO) are all