Summary:
- This study found that nitrogen-rich fertilizers used on grasslands can increase the production of pollen, which can worsen pollen allergies in people.
- The increased pollen production is caused by the nitrogen fertilizers promoting the growth of grasses, which then produce more pollen.
- This is an important finding as it shows how human activities like agriculture can have unintended consequences on public health by exacerbating conditions like hay fever and asthma.