Polluted example sentences

Clean water would have BOD value of less than 5 ppm whereas highly polluted water could have a BOD value of 17 ppm or more.It may be pointed out that although pollution due to noise, air and water is now here to stay, some practices on the part of the community can go a long way in making our precious environment less polluted and healthier for all of us.These have been applied to the major polluted rivers of the country under the NRCP.The organic chemicals are another group of substances that are found in polluted water.SO2 and NO2 after oxidation and reaction with water are major contributors to acid rain, because polluted air usually contains particulate matter that catalyse the oxidation.So, it is not only living organisms that get affected by polluted air but non-living things like buildings, monuments and statues also get affected.For example, a few years ago, Delhi was one of the most polluted cities in the world.Can ground water get polluted by sewage? How? Water contaminated with sewage may contain bacteria, viruses, fungi and parasites which cause diseases like cholera, typhoid and jaundice.Water is the elixir of life but the same water, if polluted by pathogens, organic wastes, toxic heavy metals, pesticides etc.Lately, there has been a growing concern that even if there is ample water to meet the needs of the people, much of it may be polluted by domestic and industrial wastes, chemicals, pesticides and fertilisers used in agriculture, thus, making it hazardous for human use.Laws for industrial units should be strictly implemented so that polluted water is not disposed off directly into rivers and lakes.Ozone is a toxic gas and both NO2 and O3 are strong oxidising agents and can react with the unburnt hydrocarbons in the polluted air to produce chemicals such as formaldehyde, acrolein and peroxyacetyl nitrate.And the same problem now began to come up in these areas – for now these places became polluted., get mixed with water, the water becomes polluted.Both the surface water and groundwater get polluted.