When there is no air movement, the relationship between the intrapulmonary and atmospheric pressure is that?

When there is no air movement, the relationship between the intrapulmonary and atmospheric pressure is that they are equal. In the start of a respiratory cycle, as the air is not moving, intrapulmonary and atmospheric pressure are equal. Inhalation only started with the intrapleural pressure falls off that in return helps with the enlargement of the thoracic cavity.