The air in Durban usually has a higher water vapor content than the air in Johannesburg because of differences in temperature and humidity. Durban is located near the coast and has a humid subtropical climate, while Johannesburg is located further inland and has a semi-arid climate. The warmer temperatures in Durban lead to more evaporation of water and therefore a higher water vapor content in the air. Additionally, the humidity in Durban is generally higher due to its proximity to the ocean, which further contributes to a higher water vapor content in the air. These differences in temperature and humidity result in the air in Durban having a higher water vapor constant than the air in Johannesburg