Air pollutants
Ozone
It is important that we measure ozone at ground level, as high concentrations can cause health and environmental problems.
Nitrogen oxides
How nitrogen oxides form, their environmental and health effects, and methods to measure them.
Carbon monoxide
Carbon monoxide is a gas formed when substances containing carbon (such as petrol, gas, coal and wood) are burned with an insufficient supply of air.
Sulfur dioxide
When sulfur dioxide combines with water, it forms sulfuric acid - the main component of acid rain. When acid rain falls, it can cause deforestation.
Air toxics
Air toxics are gases, particles or aerosols in the air at concentrations where their toxicity poses a hazard to human health and plant and animal life.
Metals
The occurrence, environmental and health effects, and measurement of metal air pollutants like lead, arsenic, cadmium, copper and zinc.
Particles
Airborne particles can be present at levels where they pose a hazard to human health or be deposited in amounts that cause a nuisance.