What would increase the pressure of a gas?
- decrease of the volume
- increase of the temperature
-- Force more gas into the same container.
-- Force the same amount of gas into a smaller container.
-- Heat the gas.
As indicated by the Ideal Gas Laws, increasing temperature will tend to increase both volume and pressure. Of course, volume can't always increase, that depends upon the flexibility or inflexibility of the container that the gas is in, and if the volume does increase that will counteract the increase in pressure that would otherwise have happened. Temperature, pressure, and volume are all interconnected in a gas.