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Table 1 Grading standard and health recommendation of AQI

From: A prospective study of salvational intervention with ICS/LABA for reducing chronic obstructive pulmonary disease exacerbation under severe air pollution (SIRCAP) in Beijing: protocol of a multi-center randomized controlled trial

AQI AQI level Concentration of primary pollutant (ug/m3) Classification of AQI & representative color Effect Recommendation
0–50 Grade1 0–35 Excellent Green Almost no air pollution All individuals can take normal activities
51–100 Grade2 35–75 Good Yellow Some pollutant have weak impact on some sensitive individuals The sensitive individuals should reduce outdoor activities
101–150 Grade3 75–115 Slight pollution Orange Symptoms are aggravated in susceptible population;
Irritative symptoms show in healthy individuals
Children, the elderly and people with cardiopulmonary diseases should reduce long-term and high-intensity outdoor exercise
151–200 Grade4 115–150 Moderate Pollution red Symptoms are further aggravated in susceptible population;
Some influences on cardiopulmonary system are shown in healthy individuals
Children, the elderly and people with cardiopulmonary diseases should avoid l long-term and high-intensity outdoor exercise
General population should moderately reduce outdoor activities
201–300 Grade5 150–250 Severe pollution Purple Symptoms are significantly aggravated in patients with cardiopulmonary diseases;
Symptom are shown generally in healthy individuals
Children, the elderly, the people with heart disease or respiratory disease should avoid outdoor activities
General population should reduce outdoor activities
> 300 Grade6 250–500 Extremely severe pollution maroon Tolerance of exercise decreased with obvious symptoms in healthy individuals;
Some diseases appears in advance
Children, the elderly and patients should stay indoor
General population should reduce outdoor activities
  1. The information is original in Chinese on website< http://www.bjmemc.com.cn/g374/s1046/t1662.aspx > presented by Beijing Municipal Environmental Protection Bureau>