Figure 4

Percentage changes of area affected by drought at different intensities for the period of 1982–2016 in Jing-Jin-Ji region. (a) VHI < 5 indicates exceptional drought (D4); (b) VHI < 15 indicates extreme drought (D3); (c) VHI < 25 indicates severe drought (D2) and (d) VHI < 35 indicates moderate drought (D1).