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Causes of environmental pollution are: Due to pesticides, plant protection chemicals and chemical toxins. Due to radioactive agents from outside the earth.  Due to industrial solid waste.  Due to noise, dust from vehicles and business activities, human production ...

Roomless measures at my school are: planting trees, not littering, ...

Vacant measures in my community are: planting forest trees, building an environmental management system, investing in modern equipment, focusing on professional training for the team in charge of environmental protection, ...

Pollution is the largest cause of of death in developing countries. Exposures to polluted soil, water and air (both indoor and outdoor) killed 9 million people in 2012. 8.4 million of them in low- and middle-income countries. Worldwide, pollution kills one in seven people. 

In chemistry, a solution is a special type of homogeneous mixture composed of two or more substances. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent. The mixing process of a solution happens at a scale where the effects of chemical polarity are involved, resulting in interactions that are specific to solvation. The solution usually has the state of the solvent when the solvent is the larger fraction of the mixture, as is commonly the case. One important parameter of a solution is the concentration, which is a measure of the amount of solute in a given amount of solution or solvent. The term "aqueous solution" is used when one of the solvents is water.