re: For your information.
The average sea-level air pressure reading is 1013.25 mb (29.92 inch of mercury). The usual worldwide range in sea level air pressure is about 970 to 1040 mb (28.64 to 30.71 inch of mercury).
http://userpages.umbc.edu/~tokay/chapter5.html
I know you will not believe me when I say that 100 years ago the average air pressure at sea level was 32 inches of mercury.
These measurements were done with a mercury barometer.
Mercury barometer consists of a glass tube and an open container of mercury. The tube, filled with mercury, is inverted into the container. The height of the mercury column is a measure of the air pressure. The average air pressure at sea level supports the mercury column in the tube to a height of 760 mm.
The reason I can state that the average pressure at sea level was 32in., of mercury is because I read about the experiments in a book that was more than 100 years old, unfortunately that information is no longer available, and that is why you will not believe me, but just to provide information that the air pressure can go to that pressure even in more modern times, I give you this info taken from the same web site as above.
The lowest sea level air pressure ever recorded was 870 mb (25.69 in.) in the eye of Typhoon (Tip) over the Pacific Ocean, whereas the highest sea level air pressure ever recorded was 1084 mb (32.01 in.) at Siberia associated with an extremely cold air mass.