Clean Fresh Air

We had springy weather the past days so I was able to open some windows for much needed fresh air. I've had enough of the cold weather to say the least, so getting warm weather like this is a welcome change. My two boys have been alternately coughing and sneezing mostly due to dusty air circulating in the house. I just couldn't wait for the real spring to arrive so I could open all my windows for real fresh air, spring air means free home ventilation.