1.   Cellars are considered dangerous for habitation precisely because they allow for little circulation of air, presenting sanitary problems as well as a fire hazard.

2.   Federal inspection teams shut down three meat processing plants this week because of rodents or other sanitary problems, Agriculture Department officials said on Thursday.

3.   The report also highlighted sanitary problems.

4.   While schools and other public services were not immediately affected, many gradually shut down because of sanitary problems such as uncollected garbage.