The application fields of air compressors for human respiration mainly include firefighting, industry, diving, shipbuilding, military, police, and emergency medical fields. Here are introductions to these fields:

1. Firefighting field: In the firefighting field, the air provided by the air breathing compressor is used for respiratory protection of firefighters in thick smoke or toxic environments.

2. Industrial field: In the industrial field, especially in situations where high-purity air is required, such as chemical, petroleum, and natural gas industries, air breathing compressors provide safe breathing gas for workers.

3. Diving field: In the diving field, air breathing compressors are used to fill divers' respirators, ensuring that they can breathe clean air underwater.

4. Naval domain: In the naval domain, submarines and other naval vessels use air breathing compressors to maintain the air quality inside the cabin and ensure the safety of crew members.

5. Military field: In the military field, when the military operates in special environments, air breathing compressors provide necessary breathing support, especially in chemical, biological, or nuclear contaminated environments.

6. Police field: In the police field, when performing dangerous tasks such as responding to terrorist attacks or conducting high-risk arrest operations, police may use air provided by air breathing compressors to protect themselves.

7. In the field of first aid, ambulances and emergency medical response teams use air breathing compressors to provide respiratory support in emergency situations.

Overall, air compressors for human respiration play a crucial role in multiple fields. They not only ensure the safety of professionals in special environments, but are also an indispensable part of modern medical and emergency response systems.