It’s another day of heavy haze in the Chinese capital. Beijing’s meteorological station issued a yellow alert early Saturday morning, the second highest on the four-tier warning system. This is the third haze alert this week.

The level of PM 2.5 in Beijing has risen sharply to 300, which means heavy pollution. Visibility is also reduced to less than 100 meters in the worst affected parts of the city.

In the past month, northern and eastern China were plagued by continuous haze. Cities like Beijing and Tianjin were blanketed for more than 15 days, the worst since 1961.

Beijing’s weather authority forecasts that winds will hit the capital, which could clear the air from early Sunday. But two more bouts of hazy weather will make a comeback next week in some parts of northern and eastern China.