Definition. The 30-day change in the regional price series constructed from price movements that occur during Asian working hours, between 8am and 8pm China Standard Time (00:00-12:00 UTC). US Month-over-Month Price Change and EU Month-over-Month Price Change are the counterparts for the other regions.

Technical. Regional prices are constructed in a two-step process. First, price movements are assigned to regions based on working hours in the US, Europe, and Asia. Regional prices are then derived by taking the cumulative sum of the price changes over time for each region. Price changes during hours in which the working hours of several regions overlap are split equally between those regions.