Cleaning after a flood may include the use of diesel or gas operated pumps, generators and high pressure washers. All this equipment emits carbon monoxide, an odorless and colorless, but deadly gas. All the equipment operated with gas or diesel must be used OUTSIDE, and never take it into a building. It is almost impossible to assess if ventilation is adequate. NIOSH has investigated several deaths by carbon monoxide poisoning. Deaths were caused by gas operated engines inside a building or in confined spaces.
 
MUSCULOSKELETAL HAZARDS:

Cleaning workers are at risk of developing musculoskeletal injuries in hands, back, knees and shoulders. Special attention needs to be paid to avoid back injuries. These injuries are associated with lifting things by hand and handle rubble and construction material. To avoid injuries, two or more people are necessary to move bulky objects. In addition, a single person should not lift material over  pounds, and semiautomatic equipment must be used to lift it.

THERMAL STRESS FACTORS:

Heat

Cleaning crews are at serious risk of developing  heat stress. Excessive exposure to hot environments can cause a variety of heat related problems, such as heat exhaustion, cramping and fainting spells. To reduce the possibly of heat stress, drink a glass of water every 15 -20 minutes and wear baggy, light clothes. In addition, work-break cycles must be incorporated, working during the coolest hours of the day (when possible) or distribute work well. If there is no air conditioning, open the windows and use fans.

Cold

The body will lose heat faster than it can replace it if the person stop or works in water below 75° F (24° C), which causes hypothermia. To reduce the risk of hypothermia, wear rubber boots, ensure the clothes and boots are properly insulated, avoid working alone, take frequent breaks outside of the water and wear dry clothes when possible.