chlorine free, definition of

Air pollution occurs when the air contains gases, dust, fumes or odour in harmful amounts. That is, amounts which could be harmful to the health or comfort of humans and animals or which could cause damage to plants and materials.

The substances that cause air pollution are called pollutants. Pollutants that are pumped into our atmosphere and directly pollute the air are called primary pollutants. Primary pollutant examples include carbon monoxide from car exhausts and sulfur dioxide from the combustion of coal.

Further pollution can arise if primary pollutants in the atmosphere undergo chemical reactions. The resulting compounds are called secondary pollutants. Photochemical smog is an example of this.

• Natural Swimming Pools Let You Beat the Heat, and Ditch the Chemicals
  There are few experiences that are as refreshing as dipping into a cool swimming pool on a sweltering summer day. As climate change continues and summer temperatures soar, taking refuge in cool water is one way to beat the heat (and keep sanity intact)....
• Gorgeous Natural Swimming Pool Uses No Chlorine
  Located in Moncada, this natural swimming pool is 130 sq meters, including the swimming area and the regeneration zone. In order to ditch the chlorine, the regeneration zone is used to filter and clean the water. It takes up about half the pool area,...
• No Chlorine Necessary for this Gorgeous Natural Swimming Pool Surrounded by Edible Plants
  Located in Moncada, this natural swimming pool is 130 sq meters, including the swimming area and the regeneration zone. In order to ditch the chlorine, the regeneration zone is used to filter and clean the water. It takes up about half the pool area,...