Pesticide standard values for many current and historical largely used pesticides such as DDT, aldrin, lindane, glyphosate, MCPA, chlorpyrifos, and 2,4-D often vary over seven, eight, or nine orders of magnitude and are log-normally distributed, which indicates that there is little agreement on the regulation of pesticide standard values among worldwide jurisdictions.[13] Additionally, many worldwide pesticide standard values are not sufficiently low to protect public health based on human health risk uncertainty bounds calculations and maximum legal contribution estimations.[14]