The nitric oxide was cooled and oxidized by the remaining atmospheric oxygen to nitrogen dioxide, and this was subsequently absorbed in dilute nitric acid.
These dangerous pollutants are known as the criteria pollutants, and include ozone, particulates, sulfur dioxide, nitrogen dioxide, carbon monoxide, and lead.
The company created a thale cress whose leaves turn brown in the presence of nitrogen dioxide, a compound which is leached into the soil by unexploded land mines.
