| Air pollution | The presence in or introduction into the air of a substance which has harmful or poisonous effects. |
| Fossil fuel | A natural fuel such as coal or gas, formed in the geological past from the remains of living organisms. |
| Chemical (s) | A distinct compound or substance, especially one which has been artificially prepared or purified |
| Exhaust | Waste gases or air expelled from an engine, turbine, or other machine in the course of its operation. |
| Power plant / power station | An installation where electrical power is generated for distribution. |
| Fume(s) | An amount of gas or vapour that smells strongly or is dangerous to inhale. |
| Dust | Fine, dry powder consisting of tiny particles of earth or waste matter lying on the ground or on surfaces or carried in the air. |
| Particle | Any of numerous subatomic constituents of the physical world that interact with each other, including electrons, neutrinos, photons, and alpha particles. |
| Sunset | Dusk, the moment each day when the sun goes below the western horizon and we can't see it. |
| North Star (Polaris) | A bright star that can be seen in the sky in northern parts of the world when you look directly toward the north |
| Planet | A large body in outer space that circles around the sun or another star. Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto are all planets in our solar system |
| Moon | A large round object that circles around a planet or the Earth |
| Light pollution | Light from cities, vehicles, etc., that makes it difficult to see things in the sky (such as stars) at night |
| Star | Objects in space that look like points of light in the night sky, visible from the Earth |
| Longitude | The distance on the earth's surface east or west of an imaginary line on the globe that goes from the north pole to the south pole and passes through Greenwich, England. |
| Latitude | The distance between the equator and a point north or south on the earth's surface. |
| Sky | The space over the Earth where the sun, moon, stars, and clouds appear |
| Factor | One of the things that cause something to happen |
| Atmosphere | The whole mass of air that surrounds the Eart |
| Harmful | Causing or likely to cause harm; dangerous |
| Environment | All the things together that surround animals and humans in the natural world. |
| Causes | Something or someone that produces an effect, result, or condition, something or someone that makes something happen or exist |
| Dust | Tiny, dry pieces of soil, dirt, or other material |
| Factory | A building or set of buildings where products are made by machines |
| Chemicals | A substance that is made by a chemical process |
| Particle | Electron or proton, something that is smaller than an atom |
| Natural | Existing in nature and not made or caused by people. Coming from nature. Not having any extra substances or chemicals added, not containing anything artificial |
| Release | To let go, to set free somebody or something |
| Car exhaust | the smoke or gas given off by an engine. |
| Gasoline | A liquid made from petroleum and used especially as a fuel for engines |
| Decrease | To become smaller in size, amount, number, etc. |
| Increase | To become larger or greater in size, amount, number, etc. |
| Smog | A type of severe air pollution. |
| Acid rain | Rain or any other form of precipitation that is unusually acid, meaning that it has elevated levels of hydrogen ions (Low Ph) |