Why is the ultraviolet ray so high in Poyang County?

It is related to the altitude angle of the sun. Baidu map shows that Poyang County is located in the northeast of Jiangxi Province, which belongs to subtropical humid area and is related to the height of the sun. Poyang county has a high sun angle, clear weather, good atmospheric transparency and strong ultraviolet intensity. The landform of Poyang County is dominated by hills and low mountains, which are high in the northeast and low in the southwest.