Dust

Dust is made of fine particles of solid matter. It can be found floating in the air and comes from many places. Wind can lift soil into the air, volcanoes can send particles into the sky, and pollution also adds to dust in the atmosphere.

Inside homes, dust is mostly made up of dead skin cells, along with tiny pieces of plant pollen, human hairs, animal fur, fibers from clothes and paper, minerals from soil, and even small particles from burnt meteorites. All these bits and pieces collect together to form the dust we see and sometimes feel in our everyday lives.

Atmospheric

Atmospheric dust, also called wind-borne dust, comes from dry places where strong winds pick up small bits of soil. This happens in areas where animals graze, farming occurs, vehicles travel, and human activities make the land unstable. Large parts of the world, like the Sahara Desert, are natural sources of dust.

When dust is blown into the air, it can travel far. For example, dust from the Sahara can reach places like the Caribbean and the Amazon basin. This dust can change the temperature and affect rainfall in those areas.

Coal

Coal dust can cause a respiratory disease called pneumoconiosis, especially in coal miners. Because of this danger, some places have laws to keep the air clean at work. In very rare cases, if a lot of coal dust is in the air in a small space, it can cause a dust explosion.

Control

Atmospheric

Most environmental agencies, like the United States Environmental Protection Agency, require places that make dust to find ways to reduce it. This is especially important at new housing sites in cities. Laws make sure these sites have plans to control dust while working. Simple steps like spraying water on construction or demolition sites can help keep dust down and protect nearby roads.

These rules help with many problems, like reducing health issues, making roads safer, keeping air and cars cleaner, and even helping farms grow better crops.

Domestic

Controlling dust inside homes is important because dust can be bad for kids, older people, and anyone with breathing problems. Dust can easily float around, so it’s best to clean carefully to avoid spreading it. Special filters called HEPA can catch most tiny pieces of dust. Vacuum cleaners with these filters or central vacuum systems can help keep homes cleaner.

Dust resistant surfaces

Some surfaces are made to resist dust better. This can be done during making things or by fixing them later. Special coatings or seals can help keep dust away from important parts of objects.

Outer space

Cosmic dust is found all around us in outer space, where clouds of gas and dust help form planetary systems. The soft glow we sometimes see in the night sky, called the zodiacal light, is sunlight shining off tiny bits of dust orbiting our Sun. The beautiful tails seen behind comets are made from dust and gas leaving the comet's body. Even planets like Mars can have huge dust storms that cover much of their surface. Dust also exists between the stars, creating beautiful cloudy areas called diffuse nebulae and reflection nebulae.

Scientists study dust from space to learn about our early solar system. Space missions like Stardust have collected samples of dust from comets and brought them back to Earth for study. In 2010, the Japanese spacecraft Hayabusa returned dust samples from the surface of an asteroid.

Atmospheric gallery

Dry, windy weather can send clouds of dust across south-eastern Australia. You can also see dust moving from Argentina's Pampas and over Kuwait and the north-western tip of the Persian Gulf.

Dust bunnies

Dust bunnies are tiny piles of dust that gather under furniture and in corners that aren’t cleaned often. They are made of hair, tiny bits of fabric, flakes of dead skin, spider webs, dust, and sometimes small pieces of trash. These piles stay together because of static electricity and how the pieces stick together like felt. Dust bunnies can sometimes contain tiny creatures called dust mites and may block air flow in electronics, which can make them work less well. People sometimes use dust bunnies as a way to think about how tiny pieces of matter can come together to form larger objects in space.

Dust mites

House dust mites are tiny creatures that live in homes everywhere. They eat dead skin cells from people but do not live on anyone who is alive. Dust mites and their waste are part of what makes up house dust. Because they are heavy, they do not stay floating in the air for long and are usually found on floors and other surfaces.

Dust mites like dark, warm, and damp places. They grow well in mattresses, bedding, upholstered furniture, and carpets. Their waste can cause problems when a person breathes it in, as it may affect the body. Dust mites became more of an issue when people started using fabrics like blankets and clothing.

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