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| 14006999070 | Air pollution | The introduction of chemicals, particulate matter or microorganisms into the atmosphere at concentrations high enough to harm plants, animals, and materials such as buildings, or to alter ecosystems. | 0 | |
| 14006999071 | Particulate matter (PM) | Solid or liquid particles suspended in air. Also known as Particulates; Particles. |  | 1 |
| 14006999072 | Particulates | Solid or liquid particles suspended in air. Also known as Particulate matter (PM); Particles. | | 2 |
| 14006999073 | Particles | Solid or liquid particles suspended in air. Also known as Particulate matter (PM); Particulates. | | 3 |
| 14006999074 | Haze | Reduced visibility. |  | 4 |
| 14006999075 | Photochemical oxidant | A class of air pollutants formed as a result of sunlight acting on compounds such as nitrogen oxides. | 5 | |
| 14006999076 | Ozone (O3) | A secondary pollutant made up of three oxygen atoms bound together. |  | 6 |
| 14006999077 | Smog | A type of air pollution that is a mixture of oxidants and particulate matter. | 7 | |
| 14006999078 | Photochemical smog | Smog that is dominated by oxidants such as ozone. Also known as Los Angeles-type smog; Brown smog. |  | 8 |
| 14006999079 | Los Angeles-type smog | Smog that is dominated by oxidants such as ozone. Also known as Photochemical smog; Brown smog. |  | 9 |
| 14006999080 | Brown smog | Smog that is dominated by oxidants such as ozone. Also known as Photochemical smog; Los Angeles-type smog |  | 10 |
| 14006999081 | Sulfurous smog | Smog dominated by sulfur dioxide and sulfate compounds. Also known as London-type smog; Gray smog; Industrial smog. |  | 11 |
| 14006999082 | London-type smog | Smog dominated by sulfur dioxide and sulfate compounds. Also known as Sulfurous smog; Gray smog; Industrial smog. |  | 12 |
| 14006999083 | Gray smog | Smog dominated by sulfur dioxide and sulfate compounds. Also known as Sulfurous smog; London-type smog; Industrial smog. |  | 13 |
| 14006999084 | Industrial smog | Smog dominated by sulfur dioxide and sulfate compounds. Also known as Sulfurous smog; London-type smog; Gray smog. |  | 14 |
| 14006999085 | Volatile organic compound (VOC) | An organic compound that evaporates at typical atmospheric temperatures. | 15 | |
| 14006999086 | Primary pollutant | A polluting compound that comes directly out of a smokestack, exhaust pipe, or natural emission source. |  | 16 |
| 14006999087 | Secondary pollutant | A primary pollutant that has undergone transformation in the presence of sunlight, water, oxygen, or other compounds. | | 17 |
| 14006999088 | Thermal inversion | A situation in which a relatively warm layer of air at mid-altitude covers a layer of cold, dense air below. |  | 18 |
| 14006999089 | Inversion layer | The layer of warm air that traps emissions in a thermal inversion. | 19 | |
| 14006999090 | Asbestos | A long, thin, fibrous silicate mineral with insulating properties, which can cause cancer when inhaled. |  | 20 |
| 14006999091 | Sick building syndrome | A buildup of toxic pollutants in an airtight space, seen in newer buildings. | 21 |
