https://www.healthcentral.com/article/tree-pollen-triggers-asthma
Asthma

Tree Pollen Triggers Asthma

    John Bottrell

    John Bottrell

    John Bottrell is a registered Respiratory Therapist. He wrote for HealthCentral as a health professional for Asthma and Chronic Obstructive Pulmonary Disease (COPD).