â What/How do you mean?â = â Meaning? â [=what exactly do you mean when you say that?] âHe can be a little difficult.â â I know what you mean.â [=I agree]
It has an atmospheric life of 3,200 years and global warming potential 23,900 times stronger than carbon dioxide. SF6 is considered one of the most dangerous greenhouse gases known. It is banned as a tracer gas and is limited to high voltage applications. In addition, the US Department of Energy repaired leaks in several laboratories, thereby reducing emissions by 35,000 pounds a year.
The most harmful of the gases and pollutants that emitted are particulate matter, carbon dioxide, polycyclic organic matter, and formaldehyde. (b) On plants. Photochemical smog has a deleterious effect on plants. Chronic exposure to ozone may weaken plants and make them susceptible to disease and reduce crop yield.