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Measured in micrograms/m3 (µg/m3). 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. PM10 monitors particles that are less than 10 micrometres in diameter.

Measured in micrograms/m3 (µg/m3). 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. PM2.5 monitors particles that are less than 2.5 micrometres in diameter.

Measured in micrograms/m3 (µg/m3). 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. PM1 monitors particles that are less than 1 micrometres in diameter.

Measured in parts per million (ppm). Equivalent CO2 is the concentration of CO2 that would cause the same level of radiative forcing as a given type and concentration of greenhouse gas.

Measured in parts per billion (ppb). Total volatile organic compounds is a grouping of a wide range of organic chemical compounds to simplify reporting when these are present in ambient air or emissions. Many substances, such as natural gas, could be classified as volatile organic compounds (VOCs).

Measured in A-weighted decibels (dBA). Decibel’s (dB) 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. A-weighted decibels, abbreviated dBA, are an expression of the relative loudness of sounds in air as perceived by our ears.

Measured in Lux. Lux is a measure of how much light is spread over a given area. A full moon clear night is around 1 lux, inside an office building you usually have 400 lux and a bright day can be more than 20000 lux.

Measured in (kPa). 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.

Measured in percentage. 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.

Measured in degrees Celsius. 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.