Nitrogen dioxide is a toxic gas. It is a pollutant in some urban areas due the excess air required for complete combustion of fuels introduces nitrogen into the combustion of internal combustion engines (cars, trucks, ships...) and power stations. ⚠ Note: values are offered in RS (sensor resistance in kOhm) as a relative measurement from the R0 (sensor zero resistance). Due to sensor intra-model variability we recommend using this as a relative measurement within the same kit readings.

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Carbon monoxide is a colorless, odorless, and tasteless gas. It is a pollutant in some urban areas coming from the exhaust of internal combustion engines (cars, trucks, ships...) and incomplete combustion of various other fuels. ⚠ Note: values are offered in RS (sensor resistance in kOhm) as a relative measurement from the R0 (sensor zero resistance), we approximate R0 at 75kOhm.

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dB's measure sound pressure difference between the average local pressure and the pressure in the sound wave. A quiet library is below 40dB, your house is around 50dB and a diesel truck in your street 90dB.

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Air temperature is a measure of how hot or cold the air is. It is the most commonly measured weather parameter. Air temperature is dependent on the amount and strength of the sunlight hitting the earth, and atmospheric conditions, such as cloud cover and humidity, which trap heat.

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Relative humidity is a measure of the amount of moisture in the air relative to the total amount of moisture the air can hold. For instance, if the relative humidity was 50%, then the air is only half saturated with moisture.

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Barometric pressure is the pressure within the atmosphere of Earth. In most circumstances atmospheric pressure is closely approximated by the hydrostatic pressure caused by the weight of air above the measurement point.

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PM stands for particulate matter: the term for a mixture of solid particles and liquid droplets found in the air. Some particles, such as dust, dirt, soot, or smoke, are large or dark enough to be seen with the naked eye.

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The SCK remaining battery level in percentage.

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