globalasthmareport.org/burden/burden.php Over 300 million people worldwide http://www.globalasthmareport.org/burden/burden.php experiencing asthma symptoms http://www.globalasthmareport.org/burden/burden.php http://www.globalasthmareport.org/burden/burden.php http://www.globalasthmareport.org/burden/burden.php low and middle-income countries http://www.globalasthmareport.org/burden/burden.php Over 300 million people worldwide