VOICED : Spring in Japan: beautiful blossoms and hayfever misery

In Japan, cherry blossoms mark spring, but also signal pollen allergies for many. Over 20% of the population suffers from hay fever, leading to a booming market for anti-allergy products like masks and air purifiers. Cedar trees, planted post-WWII, are a major pollen source, prompting Tokyo to replace them with less pollen-producing varieties. A promising immunotherapy treatment using pollen-based drops could alleviate symptoms for 30% of sufferers, while the anti-allergy industry continues to thrive, valued at 1.5 billion euros annually.

What is the new immunotherapy treatment mentioned in the text?

What is the estimated worth of the anti-allergy market in euros?