Information about PM2.5

Atmospheric particulate matter (PM) of fine particles that has a diameter of less than 2.5micrometers is called the PM2.5. Invisible to the eyes.

Sources

The main sources of PM2.5 are vehicles, power plants, deforestation (forest fires, wood burning, agricultural burning), and environmental disasters such as volcanic eruption.

Effect

The fine particles stay in the air and are inhaled by humans which enter the nose or throat and reach down into the lungs and circulatory system.

Effects on health include: lung disease, heart disease, worsen asthma, other respiratory problems, and eventually death.

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24-hour PM2.5 levels

PM2.5 Air Quality Index PM2.5 Health Effects Precautionary Actions
0 to 12.0 Good 0 to 50 Little to no risk. None.
12.1 to 35.4 Moderate 51 to 100 Unusually sensitive individuals may expereience respiratory symptoms. Unusually sensitive people should consider reducing prolonged or heavy exertion.
35.5 to 55.4 Unhealthy for Sensitive Groups 101 to 150 Increasing likelihood of respiratory symptoms in sensitive individuals, aggravation of heart or lung disease and premature mortality in persons with cardiopulmonary disease and the elderly. People with respiratory or heart disease, the elderly and children should limit prolonged exertion.
55.5 to 150.4 Unhealthy 151 to 200 Increased aggravation of heart or lung disease and premature mortality in persons with cardiopulmonary disease and the elderly; increased respiratory effects in general population. People with respiratory or heart disease, the elderly and children should avoid prolonged exertion; everyone else should limit prolonged exertion.
150.5 to 250.4 Very Unhealthy 201 to 300 Significant aggravation of heart or lung disease and premature mortality in persons with cardiopulmonary disease and the elderly; significant increase in respiratory effects in general population. People with respiratory or heart disease, the elderly and children should avoid any outdoor activity; everyone else should avoid prolonged exertion.
250.5 to 500.4 Hazardous 301 to 500 Serious aggravation of heart or lung disease and premature mortality in persons with cardiopulmonary disease and the elderly; serious risk of respiratory effects in general population. Everyone should avoid any outdoor exertion; people with respiratory or heart disease, the elderly and children should remain indoors.
Source: U.S.A Environmental Protection Agency