Danube is blooming after 40 years

The water of Danube hasn't been so clean for a long time like in the last years. This shows the result of the environmental actoins of the countries next to Danube. The most important environmental event of the river in Budapest is the mass appearance of a protected species called Danube mayfly (Ephoron virgo). They dissapeared in the last 40 years due to water pollution.