All individuals are at risk of developing skin cancer. However, there are groups, most notably outdoor workers, which are at greater risk than others. This seems quite likely is understandable considering the substantial amount of time they spend exposed to UVR - at least 30 hours per week. Furthermore, this exposure is approximately 6 to 8 times greater compared with than indoor workers.
I have made a few amendments above. Also, please note the correct spelling of "grammar".