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From volcanoes to cities: What is the mysterious source of atmospheric particulate matter?
In our daily lives, air quality is often ignored, but in fact the air around us is filled with various tiny particles. These tiny particles are called atmospheric aerosols, and they come not only from the natural environment but also from human activities. This article explores how these seemingly invisible substances impact our lives and how widespread their sources are.
What are atmospheric suspended particles?
Atmospheric suspended particles refer to tiny solid or liquid particles suspended in the air. They are divided into many types according to different sizes. PM10 refers to coarse particles less than 10 microns in diameter, while PM2.5 refers to fine particles less than 2.5 microns in diameter. Studies have shown that these particles can penetrate the lungs and bloodstream, causing serious health problems such as heart disease, lung disease, and cancer.
Source of particles
The sources of atmospheric suspended particles can be divided into natural sources and man-made sources. Natural sources include volcanic eruptions, dust storms and ocean noise, which release large amounts of tiny particles. Anthropogenic sources mainly come from activities such as burning fossil fuels, industrial emissions, and home heating.
According to reports, about 90% of atmospheric aerosols come from natural sources, and only 10% come from human activities.
Health effects of these particles
According to research by the World Health Organization, the impact of exposure to PM2.5 cannot be underestimated, causing more than 4.1 million deaths every year from diseases such as heart disease and lung cancer. The harm of these particles is not limited to the respiratory system, but may also affect the nervous system and even promote risks such as premature birth.
Impact on climate
In addition to their health effects, atmospheric particulate matter also plays an important role in climate change. They modify the incoming solar radiation and the escaping terrestrial radiation through scattering and absorption.
Climate change scholars point out that atmospheric aerosols may be the largest source of uncertainty in future climate predictions.
Methods to reduce particulate pollution
In order to reduce the emission of these harmful particles, countries are implementing strict emission standards. From improving industrial processes to encouraging the use of clean energy, these initiatives work to protect air quality.
Challenges and future prospects
As urbanization continues to accelerate, pollution caused by human activities is still increasing. Various means of transportation, construction and agricultural activities release large amounts of suspended particulates. How to effectively control and reduce the generation of these particles will become one of the major challenges in the future.
The impact of atmospheric particulate matter has attracted widespread global attention. Can we find better ways to protect our environment and health?
