Pollution Glossary

Barometric pressure

The pressure exerted by the weight of the column of air above a given point, expressed in kilopascals. Generally speaking, when the barometric pressure is high, the air is sinking, usually resulting in fair weather. When the barometric pressure is low or falling, air is rising, usually resulting in cloudy skies and precipitation.

Benzene (C6H6) | Carbon Monoxide (CO) | Nitrogen Oxides NOx | Ozone (O3) | PM10 | Relative humidity | Solar radiation | Sulphur Dioxide (SO2) | Toluene | Xylene