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EPA \ TAQMN \ Air Quality Monitoring \ AQI \ Pollutants

Pollutants

Suspended particulates (PM2.5)

PM2.5Means particles smaller than 2.5 microns diameter pneumatic units in micrograms / cubic meter of that, as the PM2.5 than the PM10 it easier for in-depth human lung , Had a greater impact on health, fine particles and other pollutants attached to the system of deep breathing more harm.

Suspended particulate matter( PM10

PM10 is used to describe particle a diameter of 10 micrometers or less. Sources of particle matter can be dust of street, burning of fossil fuels in vehicles, open combustion, construction works, and agriculture plowing…etc. sometimes it is secondary particles derive from the oxidation of primary gases pollutant. It can settle in the lungs since its radius is smaller than 10 microns. If other pollutants adhere to those particles, it will reinforce harmfulness to the respiratory system.

Sulfur dioxide( SO2

In addition to occur naturally, sulfur dioxide generate from combustion of petroleum or coal. It is a colorless gas with a penetrating odor, can easily dissolves in the water to form sulfurous acid. It can oxidize to the sulfate in the air that is the main substance that causes the acid rain.

Nitrogen Oxides ( NOx

NOx is a generic term for mono-nitrogen oxides (NO and NO2). Its generating from combustion process that oxidizes of the nitrogen in the air or nitrides in fuel. Nitric oxide is a kind of colorless and smells-less gas, slightly dissolving in the water. The major product of combustion process is oxide, and it can react into nitrogen dioxide in the photochemical reaction.

Nitrogen dioxide is a kind of red-brown gas with stimulative smell, easily dissolving in the water to form nitrous acid and nitric acid. Through photochemical reaction, it can be decomposed to nitric oxide and oxide after desorbing sunlight. Oxidization of nitrate is one of the factors to cause acid rain.

Carbon monoxide( CO )

In addition to occur naturally such as forest fires, methane oxidization, and living creature activities, carbon monoxide generates from the incomplete combustion of the petrochemical fuels. It is colorless, smell-less and lighter than air. As the affinity between carbon monoxide and hemoglobin is hundreds times stronger than the affinity between hemoglobin and oxygen, it will decreases the oxygen-carrying capacity of the blood and inhibits the transport, delivery, and utilization of oxygen for tissues of human and animals, then cause the carbon monoxide poisoning.

Ozone( O3

Ozone is one kind of second pollutant that generates from nitrogen oxides or reactive hydrocarbon after they activated by the sunlight. It is a highly active oxidization gas, and stimulative to respiratory system that will cause cough, asthma, headache, weariness, and lung injury, especially affect to children, the old, patients, and outdoor exerciser. Furthermore, it is harmful to the plants and crop, and is also harmful to artificial material such as rubber (tires…etc.) and paints.

last update : 2017/07/31

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