Summer sun signals relief from allergies

As temperatures start to climb, the incidence of allergic reactions begins to wane, as Yang Wanli reports.

The most difficult part of the year for Zhou Yan ended with the official start of summer on May 5. That signaled an end to her severe hay fever and conjunctivitis caused by poplar flowers and willow catkins, which floated in the air like snow during spring but gradually stopped as temperatures began to climb.

"Itchy, watery eyes, swollen eyelids and sneezing - every year, I get them all the time during spring. When summer comes, the symptoms disappear and I don't have to wear a facemask or take any more medication, which is great," said the 32-year-old Beijing resident.