What is the difference between fog, smog and PM2.5 dust? Which is the most dangerous?
During this period, many provinces in Thailand have murky weather in the morning, similar to fog. But! The air is not cool. Of course, it is not fog, but smog and PM2.5 dust that are harmful to health. Reveal the difference between fog, smoke and dust.
The difference between fog, smog and dust
Fog is a gift from nature, but every time I see it, my heart beats and I feel full because it shows good air. It is often found in provinces with high โปรโมชั่นพิเศษจาก UFABET สมัครตอนนี้ รับโบนัสทันที humidity. Near water sources or in valleys in the early morning. It is water in the air or a type of hydrometeor. That consists of a group of very small water droplets that can be seen with the naked eye floating in the air near the ground.
Smog
Fog comes from the English words Smoke + Fog, an air phenomenon that contains a mixture of smoke and toxic gases, causing pollution caused by the accumulation of smoke or dust in the air, which is mostly the result of burning agricultural waste, forest fires, and incomplete combustion processes. It is consider a type of pollution that floats in the air. The main components are toxic gases such as sulfur dioxide (SO₂), nitrogen oxides (NOₓ) and small particles.
Natural causes
- Wind blows through soil, sand, water vapor, and sea salt dust. Which are then dispersed into the air, as well as smoke, forest fires, and volcanic eruptions.
Human Causes
- Industrial exhaust fumes, burning of wood, coal, forest fires, garbage burning, traffic and vehicle exhaust emissions.
Impact of smog
The danger of smog depends on the type of smog, its concentration, the duration of exposure, and the physical condition of each person, especially whether they have underlying diseases.
PM 2.5 dust
PM 2.5 stands for Particulate Matters, which is a standard term for small dust particles that are harmful to health. The number 2.5 comes from the unit of 2.5 microns. Which is tiny dust. If we compare it to the size of our hair, which is 50-70 micrometers in size, this tiny dust is 20-30 times smaller than the size of a hair. PM 2.5 can enter the respiratory tract, enter the bronchi and lungs, and enter the bloodstream, causing a risk of cerebrovascular disease, chronic obstructive pulmonary disease, ischemic heart disease, lung cancer, and acute infectious diseases of the lower respiratory tract.
As PM 10 is large, the dust will stick to the nose and mouth only, not reaching the bronchi and lungs, causing the risk of cardiovascular disease, respiratory disease, skin disease, and conjunctivitis.
Causes of PM 2.5 dust
- Forest burning and forest fires
- Pollution, exhaust fumes from vehicles
- Construction Industry
- Agricultural burning