Like us, birds need to breathe air in and out of their lungs in  order to fulfill the cycle of bringing oxygen into the body. Air is  taken in through the mouth and nasal openings of the bird. yes Birds have a nose and a mouth just like humans and just like us they breath from there nose and possibly their beak.
It is estimated that approximately two million people became homeless because of the Dust Bowl and the damage it did to their farms. Approximately 6,500 people were killed during only one year of the Dust Bowl. They died while trying to hop on freight trains to get to other parts of the country to look for work.
One hundred million acres of the Southern Plains were turning into a wasteland of the Dust Bowl. Large sections of five states were affected Texas, Oklahoma, Kansas, Colorado and New Mexico. In 1932, the national weather bureau reported 14 dust storms. The next year, they were up to 38.