Beijing was among the worst 10 cities in China for air quality in July, the first time this year the capital has dropped so low.
Only 35.5 percent of days in the month met the national standard, putting the capital at 65th among the country's 74 major cities.
According to the Ministry of Environmental Protection's monthly air quality report on Monday, most of the polluted days registered excessive ozone concentration.
Excessive concentrations of ozone can cause respiratory tract irritation, damage to the body's immune system and affect lung function. Health experts strongly suggest that people stay indoors around noon to avoid the worst of such pollution. http://en.people.cn/n/2015/0818/c90882-8937611.html
