Nitrogen dioxide is a cause of air pollution.

This factory is emitting a large amount of sulfur dioxide.

Silicon dioxide is a major component of glass and ceramics.

Air pollution is having a serious impact on the health of the planet.

His stress is one cause of his health problems.

The atmosphere of this planet is harmful to humans.

Nitrogen makes up about 78% of the Earth's atmosphere.

Based on the Air Pollution Control Law, factories must strengthen the management of exhaust gases.

The pollution in this area has become a serious problem.

Carbon dioxide is one of the main causes of global warming.