Explore the main criteria pollutants and other gases that impact air quality, and our cutting-edge sensor technology for precise measurement of them.


Ammonia (NH3) consists of nitrogen and hydrogen atoms. It is an important compound in many biological processes and is a key part of the nitrogen cycle.

Carbon Dioxide

Carbon Dioxide (CO2) is composed of a carbon atom bonded to two oxygen atoms. It’s a naturally occurring gas that is fundamental for life on Earth.

Carbon Monoxide

Carbon monoxide (CO) consists of one carbon atom and one oxygen atom. It is a toxic, odorless, colorless gas found naturally at low concentrations in the atmosphere.


Chlorine (CL2) is a toxic gas made up of two chlorine atoms. Chlorine plays an important role in water sanitation as it can kill bacteria and other microbes present in water.


Hydrogen (H) is the most abundant chemical substance in the universe. Pure hydrogen gas (H2) is scarce in the Earth’s atmosphere as it is lighter than air.

Hydrogen Sulfide

Hydrogen sulfide (H2S) is a naturally occurring colorless, toxic gas, notable for its very distinct odor (like rotten eggs) even at very low concentrations.


Formaldehyde (CH2O) is a naturally-occurring organic compound known for its pungent, irritating odor. It’s found in nature and is used in several industrial applications.


Methane gas (CH4) is a chemical compound made up of one carbon atom and four hydrogen atoms. It’s the main component of natural gas and is used for fuel.

Nitrogen Dioxide

Nitrogen Dioxide (NO2) is a highly reactive gas formed via the oxidation of nitric oxide. NO2 is typically used as a signifier for the presence of other nitrogen oxides (NOx).

Nitrogen Oxides

Nitrogen oxides (NOx) is a collective term used to refer to nitrogen monoxide (nitric oxide or NO) and nitrogen dioxide (NO2).


Ozone is an unstable gas formed by the combination of three oxygen atoms. Ground-level ozone can cause health risks and harmfully impact the environment.


Perchloroethylene (C2CL4), sometimes referred to as Tetrachloroethylene, is a colorless liquid commonly used in dry cleaning and metal degreasing.

Sulfur Dioxide

Sulfur Dioxide (SO2) is a toxic gas with a strong irritating smell, used across a range of industries - such as winemaking and for dried fruits, due to its antimicrobial properties.

Volatile Organic Compounds

Volatile organic compounds (VOCs) include a wide range of carbon-based chemicals (or compounds) found in various man-made and naturally-occurring solids and liquids.