Use of oil with tetra ethyl lead causes much pollution, with lead containing carbon monoxide, nitrogen oxide and policyclic nitro hydride.

But the nitrogen oxides that diesel engines emit are considered carcinogens, and can cause asthma.

We inject our own aerosols into the atmosphere, and we have trace gases, and not just carbon dioxide it's methane, ozone, oxides of sulfur and nitrogen.

We suspect a lot of these come from diet, green leafy vegetables, beetroot, lettuce has a lot of these nitric oxides that we think go to the skin.

With respect to air quality, a number of steps have been taken to reduce emissions, such as introduction of fees on emissions of nitrogen oxides and stricter requirements on emissions from industrial activities.

Iran states that its territory was exposed to wet deposition from approximately 350,000 tonnes of soot, as well as nitrogen and sulphur oxides, organic carbons, heavy metals and polycyclic aromatic hydrocarbons from the oil well fires in Kuwait.

Syria asserts that the analyses performed at Dura Europos reveal an external patina that contains many black metal oxides and carbon particles typical of air pollution as well as small quantities of vanadium, nickel, chromium, lead and many trace elements.

According to Iran, the damage resulted from (a) direct impacts of the increased amounts of airborne pollutants such as sulphur dioxide (SO2), nitrogen oxides (NOX,), ozone, and polycyclic aromatic hydrocarbons (b) leaf infections due mainly to black rain and (c) infection of the soil by deposits of heavy metals and toxic hydrocarbons.

Many types of natural capital, however, have not been included fresh water, soil, forests as providers of ecosystem services, and the atmosphere as a sink for such pollution as particulates and nitrogen and sulphur oxides. If these missing items were included, the poor world s economic performance over the past three decades, including China s, would look far worse.