What things should be done before demolition begins to keep workers, other people, and other properties safe if a building fell down?

Occupational Safety and Health

Explanation:

For example there should be quick exits in an emergency which includes occupational safety. Plus, there should be medical supplies which explains the need of safety

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.