Smell pleasant after the rain from where?

The bacterial spores, the acidity of rainwater and the smell of essential oils produced by plants, are the reason most people see a difference in odor in the air after the rain.

The rain has a pleasant smell that people often see in the forest is caused by bacteria. A bacteriophage, a fibrous bacterium, will grow in the soil when it is wet and warm, when dry soil creates a myriad of spores in the soil.

Strange smell comes after the rain.(Photo: IStockphoto.com/jbarkway)

The raindrops knocked these spores into moist air, and when people inhaled those spores it felt like a special smell, that was the smell of the earth after the rain, Howstuffworks said.

Another odor is caused by the acidity of rainwater. Many chemicals in the air, typically SO ₂ and NOx, are generated from natural and artificial activities. During the rain will react with atmospheric water vapor to form acid such as sulfuric acid, nitric acid. When acidic rainwater comes into contact with organic debris or chemicals on the ground, such as gasoline, will cause some unpleasant odor reactions.

Just like the smell caused by bacterial spores, the smell of chemical reactions is usually strongest after a prolonged dry spell, because if the chemicals are diluted by a previous heavy rain, they will not react. with the current rain water.

The last odor is derived from volatile essential oils created by plants, they attach to other surfaces such as soil and rock. Rain water affects essential oils on soil, rock and brings it back to the air. This scent is similar to that caused by bacterial spores, most people feel it's fresh and interesting.

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