Why is it unsafe to use a circular saw that does not have an upper blade guard?

Using a circular saw without an upper blade guard is particularly unsafe because it poses a significant risk of blade exposure. The upper blade guard is designed to cover the upper part of the blade, protecting the operator from accidental contact with the spinning blade during operation. Without this guard, the blade is exposed, increasing the likelihood of serious injuries such as cuts or amputations if the operator's hands or other body parts come into contact with it. Additionally, the guard helps to prevent debris and hazardous materials from being thrown back at the user, further enhancing safety during cutting tasks. Overall, the upper blade guard is a critical safety feature that ensures safe operation while using a circular saw.