Level SO2 NO2 CO O3 PM-10
Good - - - - -
Moderate - - - Aged and weak people: avoid outdoor activities -
Unhealthy for
sensitive groups
Asthma patients: avoid outdoor activities - Patients with cardiovascular ailment (e.g,. Heart attack): recommended to avoid excessive work and outdoor activities in traffic jam areas Active children and adults, patients with respiratory ailments (e.g.,. asthma): avoid outdoor activities for a long time Patients with respiratory (e.g, asthma) or cardiac ailments: avoid day-long outdoor activities
Unhealthy Children, asthma patients, people with cardiac or lung ailments: recommended to avoid outdoor activities - Cardiovascular ailment patients(e.g., Heart attack): Restrain oneself from even normal level work, avoid traffic jam areas containing CO in the atmosphere Active children and adults, patients with respiratory ailments (e.g., asthma): recommended to avoid day-long outdoor activities Healthy children: avoid day-long outdoor activities Issuance of an O₃alert Children, the aged, people with cardiac or lung ailments: recommended to avoid day-long outdoor activities General public: avoid day-long or excessive outdoor activities
Very unhealthy Children, asthma patients, people with cardiac or lung ailments: avoid outdoor activities General public: recommended to avoid outdoor activities Children with respiratory ailments (e.g., asthma), adults: avoid excessive outdoor activities Patients with cardiovascular ailment (. e.g., Heart attack): Restrain oneself from even normal level work, restrict activities in traffic jam areas Active children and adults, patients with respiratory ailments (e.g., asthma): prohibit outdoor activities General: restrict outdoor activities Issuance of an O₃alert Patients with respiratory ailments. (e.g., asthma), aged and weak people: restrict outdoor activities
Hazardous Children, asthma patients, people with cardiac or lung ailments: recommend indoor activities only General: Restrict outdoor activities Children or adults with respiratory ailments (e.g., asthma): Prohibit moderate or excessive outdoor activities Patients with cardiovascular ailment (e.g., Heart attack): prohibit even normal level work and activities in traffic jam areas General: prohibit excessive activities Everyone: prohibit outdoor activities issuance of an acute O₃alert Everyone: prohibit outdoor activities, Patients with respiratory ailments (e.g., asthma): indoor activities only