This claim is not true. Rain is naturally slightly acidic due to the presence of dissolved carbon dioxide in the atmosphere, which forms carbonic acid when dissolved in water. The pH of rainwater typically ranges from 5.6 to 5.8. However, rain can become more acidic when it reacts with pollutants in the atmosphere, such as sulfur dioxide and nitrogen oxides, which are emitted by power plants, factories, and vehicles. This process, known as acid rain, can have harmful effects on ecosystems and infrastructure.