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Air Quality Indices. – The following shall describe the six (6) levels of air quality for suspended particulates, sulfur dioxide, photochemical oxidants or ozone, carbon monoxide, and nitrogen dioxide anywhere in the Philippines. Levels above those indicated, with the exception of TSP, shall be considered Emergency:

(a) Particulate Matter (m g/m³)

(1) Total Suspended Particulates – (24-Hour Average)
 
 

² Areas are generally required to report the AQI based on 8-hour ozone values. However, there are a smaller number of areas where an AQI based on 1-hour ozone values would be more precautionary. In these cases, in addition to calculating the 8-hour ozone index value, the 1-hour index value may be calculated and the maximum of the two values is reported.

 
(d) Carbon Monoxide (ppm) [8-hour]
 

 

Good	None
Fair	None
Unhealthy for sensitive groups	People with respiratory disease, such as asthma, should limit outdoor exertion.
Very unhealthy	Pedestrians should avoid heavy traffic areas. People with heart or respiratory disease, such as asthma, should stay indoors and rest as much as possible. Unnecessary trips should be postponed. People should voluntarily restrict the use of vehicles.
Acutely unhealthy	People, should limit outdoor exertion. People with heart or respiratory disease, such as asthma, should stay indoors and rest as much as possible. Unnecessary trips should be postponed. Motor vehicle use may be restricted. Industrial activities may be curtailed.
Emergency	Everyone should remain indoors, (keeping windows and doors closed unless heat stress is possible). Motor vehicle use should be prohibited except for emergency situations. Industrial activities, except that which is vital for public safety and health, should be curtailed.

 

Good	None
Fair	None
Unhealthy for sensitive groups	People with respiratory disease, such as asthma, should limit outdoor exertion.
Very unhealthy	Pedestrians should avoid heavy traffic areas. People with heart or respiratory disease, such as asthma, should stay indoors and rest as much as possible. Unnecessary trips should be postponed. People should voluntarily restrict the use of vehicles.
Acutely unhealthy	People, should limit outdoor exertion. People with heart or respiratory disease, such as asthma, should stay indoors and rest as much as possible. Unnecessary trips should be postponed. Motor vehicle use may be restricted. Industrial activities may be curtailed.
Emergency	Everyone should remain indoors, (keeping windows and doors closed unless heat stress is possible). Motor vehicle use should be prohibited except for emergency situations. Industrial activities, except that which is vital for public safety and health, should be curtailed.

 

Good	None
Fair	None
Unhealthy for sensitive groups	People with cardiovascular disease, such as angina, should limit heavy exertion and avoid sources of CO, such as heavy traffic.
Very unhealthy	People should stay indoors and rest as much as possible. Unnecessary trips should be postponed. People should voluntarily restrict the use of vehicles and avoid sources of CO, such as heavy traffic. Smokers should refrain from smoking.
Acutely unhealthy	People with cardiovascular disease, such as angina, should avoid exertion and sources of CO, such as heavy traffic, and should stay indoors and rest as much as possible. Unnecessary trips should be postponed. Motor vehicle use may be restricted. Industrial activities may be curtailed.
Emergency	Everyone should avoid exertion and sources of CO, such as heavy traffic; and should stay indoors and rest as much as possible.