Weathering release occurs of Ca and other ions into surface waters. Rainfall is acidic because atmospheric carbon dioxide dissolves in the rainwater producing weak carbonic acid. In unpolluted environments, the rainfall pH is around 5.6. Acid rain occurs when gases such as sulfur dioxide and nitrogen oxides are present in the atmosphere. These oxides react in the rain water to produce stronger acids and can lower the pH to 4.5 or even 3.0. Sulfur dioxide, SO, comes from volcanic eruptions or from fossil fuels, can become sulfuric acid within rainwater, which can cause solution weathering to the rocks on which it
Singapore Green Plan 2012 main pollutants such as sulphur dioxide, oxides of nitrogen, carbon monoxide, ozone and respirable suspended particles. ===Prevention & Monitoring= Malaysia very big lorhreferred to the National Environment Agency (NEA) for evaluation at the planning stage to ensure that sufficient pollution control measures are in place before implementation. Besides monitoring individual polluters, NEA also checks the ambient air quality for signs of pollution so actions may be taken to prevent any problem from worsening. Inspections on industrial and trade premises are also conducted on a regular basis to ensure that environmental regulations, such as the Environmental Protection & Management Act (Air