Why Pm2 5 Form Persistent Aerosols Upsc?

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Is PM2 5 an aerosol?

PM2. 5 are atmospheric aerosols with a diameter no greater than 2.5 micrometers. This type of suspended dust is considered the most dangerous for human health.

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What is PM 2.5 and why is it so harmful?

Particles in the PM2.5 size range are able to travel deeply into the respiratory tract, reaching the lungs. Exposure to fine particles can cause short-term health effects such as eye, nose, throat and lung irritation, coughing, sneezing, runny nose and shortness of breath.

How does PM 2.5 become a pollutant?

Emissions from combustion of gasoline, oil, diesel fuel or wood produce much of the PM2. 5 pollution found in outdoor air, as well as a significant proportion of PM10.

What is PM 2.5 and how is it formed?

PM2.5 material is primarily formed from chemical reactions in the atmosphere and through fuel combustion. Major sources of PM2.5 include motor vehicles, smelters, power plants, industrial facilities, residential fireplaces and wood stoves, agricultural burning and forest fires.

What is the difference between an aerosol and a particulate?

Describe the difference between an aerosol and a particulate. An aerosol is a collection of suspended particles and the surrounding gases. A particulate (which is more commonly referred to as particulate matter) refers just to the suspended solid or liquid matter.

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How long does PM 2.5 stay in the air?

5 particles can travel? The smaller particles are lighter and they stay in the air longer and travel farther. PM10 (big) particles can stay in the air for minutes or hours while PM2. 5 (small) particles can stay in the air for days or weeks.

Why is PM2 5 and more harmful than PM10?

Coarse (bigger) particles, called PM10, can irritate your eyes, nose, and throat. Dust from roads, farms, dry riverbeds, construction sites, and mines are types of PM10. Fine (smaller) particles, called PM2.5, are more dangerous because they can get into the deep parts of your lungs — or even into your blood.

What is the difference between PM 2.5 and PM10 particulates?

PM10 is particulate matter 10 micrometers or less in diameter, PM2.5 is particulate matter 2.5 micrometers or less in diameter. PM2.5 is generally described as fine particles. By way of comparison, a human hair is about 100 micrometres, so roughly 40 fine particles could be placed on its width.

What is the difference between PM10 and PM2 5?

Particulate matter (PM) includes microscopic matter suspended in air or water. Airborne particles are called aerosols. PM10 includes particles less than 10 µm in diameter, PM2. 5 those less than 2.5 µm.

Is PM2 5 a primary or secondary pollutant?

There are two types of fine particulates: primary and secondary. Primary PM2.5 is emitted directly as a particle and enters the atmosphere as soot. Secondary particulates form when precursor emissions react in the atmosphere to create PM2.5.