The factors influencing the atmospheric pressure are temperature, altitude and humidity. All these factors are inversely proportional to pressure.
Central Pacific region: As this is equatorial region, high temperature and high humidity are experienced. So low pressure is the result.
Ooty:
As situated above sea level, there is a ratification of air and so the pressure is low.
Polar region:
Since the sunrays are slanting, low temperature and high pressure.
