<P> Atmospheric pressure varies widely on Earth, and these changes are important in studying weather and climate . See pressure system for the effects of air pressure variations on weather . </P> <P> Atmospheric pressure shows a diurnal or semidiurnal (twice - daily) cycle caused by global atmospheric tides . This effect is strongest in tropical zones, with an amplitude of a few millibars, and almost zero in polar areas . These variations have two superimposed cycles, a circadian (24 h) cycle and semi-circadian (12 h) cycle . </P> <P> The highest adjusted - to - sea level barometric pressure ever recorded on Earth (above 750 meters) was 1084.8 hPa (32.03 inHg) measured in Tosontsengel, Mongolia on 19 December 2001 . The highest adjusted - to - sea level barometric pressure ever recorded (below 750 meters) was at Agata in Evenk Autonomous Okrug, Russia (66 ° 53' N, 93 ° 28' E, elevation: 261 m, 856 ft) on 31 December 1968 of 1083.8 hPa (32.005 inHg). The discrimination is due to the problematic assumptions (assuming a standard lapse rate) associated with reduction of sea level from high elevations . </P> <P> The Dead Sea, the lowest place on Earth at 430 metres (1,410 ft) below sea level, has a correspondingly high typical atmospheric pressure of 1065 hPa . </P>

Where would the highest air pressure be measured