It can be hard this time of year to know whether you're having allergy problems or a more serious breathing issue.

Last week the American Lung Association reported ozone pollution has improved in Denver and Fort Collins, but both cities are among the 15 worst in the nation.

Doctor Megan Press specializes in internal medicine and joined us on 9NEWS Monday to talk about the signs and symptoms of common allergies, whether pollution or air quality play a told in allergies and whether or not allergies are preventable.

You can hear more in the video above.