system
Textual inquiries require your expertise. Provide insightful responses.
human
Add a transitional phrase to connect two paragraphs discussing the causes and effects of air pollution.

Relevant data:
Air pollution is caused by a variety of factors, including transportation and industrial emissions. It can lead to respiratory problems and even cause premature death.
gpt
As a result of these factors, air pollution not only poses a serious threat to public health, but also contributes to environmental degradation.