What is a negative ion?

Why does the air feel so refreshing after rainfall?

The answer may lie in the presence of negative ions.

Our environment is composed of molecules and atoms carrying electrical charges. When an atom contains more electrons than protons, it becomes a negatively charged ion, known as a negative ion.

In modern indoor environments, we are heavily exposed to positive ions, produced by:

• smartphones and computers
• Wi-Fi and Bluetooth waves
• air conditioning systems
• microwaves and electronic devices

These positive ions are particularly concentrated in closed professional and residential spaces. For some people, overexposure may contribute to symptoms such as fatigue, headaches, mental overload or reduced wellbeing.

Conversely, negative ions are naturally present in environments such as:

• forests
• seaside areas
• mountains
• waterfalls
• after rain and thunderstorms

A fascinating phenomenon occurs during rainfall and near waterfalls: moving water releases electrons into the air. These electrons attach to oxygen molecules, generating negative ions.

This is one reason why many people report feeling calmer, more energized and able to breathe more deeply after spending time in nature.

In a hyperconnected world dominated by screens and indoor environments, reconnecting with natural spaces may play a valuable role in supporting both respiratory comfort and overall wellbeing.