Chinese officials said anti-pollution efforts are helping clear the air in Beijing, with 86 days of fairly good air quality reported so far this year.

The Beijing Municipal Bureau of Environmental Protection said the number of so-called "blue sky" days is up from 67 during the same period last year, the state-run Xinhua news agency reported Friday.

The Chinese news service said Beijing has invested $17.1 billion dollars to improve air quality.

The number of "blue sky" days was 246 last year, compared to 100 days in 1998.

The goal is have at least 256 days of clean air each year, Xinhua said.