What environmental conditions might cause damage to the alveolar sacs, and what would be the consequences of that damage?

Following are the major environmental conditions that might cause a damage to the alveolar sacs:

1. Air pollution
2. Dust storms
3. Smog
4. Smoke

The aforementioned conditions can cause temporary or permanent damage to alveolar sacs. Damages may include: building up fluid in the sacs and accumulation of dust particles in the sacs. The consequences of that may include coughing or preventation of oxygen (air supply) into the lungs. 

A. they hold atoms  together with a molecule.its a force that exist between molecules. hope this .

One splits the atoms and molecules  the other combines them