A band of ultraviolet radiation with wavelengths from 320-400 nanometers. UVa is not absorbed by ozone, and can cause sunburn and skin damage. UVa also enhances plant life.
The longest waveband in the UV region that includes radiation from 320-400 nm range and is less hazardous.
A type of radiation that can cause skin to age and contribute to skin cancer. Most of the radiation that reaches the earth is UVA radiation.