Apart from heatwaves, higher temperatures can increase ground-level ozone and hasten the onset of the pollen season, contributing to asthma attacks.

除了热浪，气温升高可增加地面的臭氧并使花粉季节提前开始，从而造成哮喘发作。

youdao

Especially if you're a morning guy—pollen counts are highest between 5 a.m. and 10 a.m. says Fred Pescatore, M.D., author of The Allergy and Asthma Cure.

医学博士佛瑞德佩斯卡托雷曾写过《过敏症和哮喘的治疗》，他说，尤其是喜欢早上锻炼的人要注意这一点，因为早上五点到十点之间空气中花粉含量是最高的。

youdao

You are an asthma sufferer with severe pollen allergies.

如果有严重的花粉过敏引起哮喘。

youdao

As part of the wider trend of milder European winters, December pollen is troubling asthma sufferers as far north as Scandinavia.

CNN: Alpine resorts feel the heat

This has led to a huge rise in allergens and pollen in the air, which can trigger asthma attacks.

BBC: Asthma attack 'epidemic' warning

"People who are diagnosed with asthma that is made worse by pollen and people who have been diagnosed with seasonal allergic rhinitis need to keep track of pollen and other outdoor allergen levels, " says Dr. William Lunn, the director of the interventional pulmonary service at Baylor College of Medicine, in Houston.

CNN: 5 Web weapons in your war on allergies