When relative humidity is kept at about 50%, office workers have fewer respiratory problems (specifically in the winter) and generally feel better. Higher humidity makes the office feels stuffy.hen relative humidity is kept at about 50%, office workers have fewer respiratory problems (specifically in the winter) and generally feel better. Higher humidity makes the office feels stuffy.
The Dow Jones Company selects the average's stocks as the most representative companies of the different U.S. industrial sectors. Most of the Dow stocks are household names such as Coca-Cola, Walmart, AT&T;, Bank of America, Boeing, Exxon Mobil and UnitedHealth Group.
The Dow Jones Utility Average is a price-weighted index -- an index whereby which each company is weighted in proportion to their price per share (as opposed to market capitalization for example). The Dow Jones Utility Average began with 18 stocks in January 1929 and was then increased to 20 stocks on July 1, 1929. Then on June 2, 1938, the number of components was cut to 15 and has remained at that level to this day. The following table lists the 15 companies which make up the Dow Jones Utilities Average.