Choose whether the given statement is true or false.

Secondary air pollutants are formed as a result of chemical reactions that occur in the lower atmosphere. 

The given statement is true.

Secondary air pollutants are formed as a result of chemical reactions that occur in the lower atmosphere. These chemical reactions involve primary pollutants, which are emitted directly into the air from various sources, such as vehicles, power plants, and factories.

When these primary pollutants are released into the air, they can react with other substances present in the atmosphere, such as oxygen, water vapor, and nitrogen oxides. These reactions can lead to the formation of secondary pollutants, which are often more harmful than the primary pollutants themselves.

For example, when nitrogen oxides and volatile organic compounds (VOCs) react in the presence of sunlight, they can form ground-level ozone, which is a secondary pollutant. Similarly, when sulfur dioxide reacts with other compounds in the atmosphere, it can form sulfuric acid, which can contribute to acid rain.