중국기상국은 대기 경보를 3단계로 나누는데 1단계인 황색경보는 공기질지수가 하루 평균 200을 넘어서는 날이 이틀 넘게 이어질 때 발령된다.
The China Meteorological Administration divides the atmospheric caution into three phases, and also the yellowish warning, the very first stage, is given as soon as the typical air quality index exceeds 200 a day for longer than two times.