We often close the windows as soon as it starts raining, but this is a common mistake. If it’s raining during a warm season (and rainwater doesn’t splash in), open the windows for at least a few minutes.
Rain has an oxygenating effect that purifies the air in our homes, bringing in that fresh “rain smell” we all enjoy. The scent of rain comes from ozone particles that help clean the air inside.
Rain, as a purifying element, washes away the bad. So, when it rains, open the windows. Let the fresh air flow in, allowing old energies to leave and new ones to come in with the rain.
Source: Young Farmer