oxide assures improved selectivity and stability
3. Their peculiar characteristics and size effects make them interesting for metal oxide gas sensors
The reason we take Nox as target gas
1. NOx is harmful to human health in its own right.
2. NOx reaction produces tropospheric ozone.
3. NOx causes acid rain, smog, and destruction of forests.
- This problems become more serious due
oxide, but of also other greenhouse gases, being: Methane (CH4), Nitrous oxide (N2O), Hydrofluorocarbons (HFCs), Perfluorocarbons (PFCs), Sulphur hexafluoride (SF6).
If participating countries continue with emissions above the targets, then they are required to engage in emissions trading; i.e. buying "credits" from other participant countries that are able to exceed their reduction targets in o
Sulfur Dioxide(SO2)
The release of SO2 to the atmosphere is the primary cause of acid rain in the world.
Fossil fuel combustion at electric power-generating plants accounts for about70% of
the emissions.
Coal, Oil, and all other fossil fuels naturally
contain some sulfur.
Volcanic eruptions are another more localized natural source of SO2
SO2 + OH. HSO3.
HS
대 기 오 염 (Air Pollution)
1. 대기오염의 현상
1) 대기오염의 배경
∘ 공기의 성상 : 질소(N2) 78%
산소(O2) 21%
아르곤(Ar) 0.9%
탄산가스(CO2) 0.03%
∘ 농도 표현법 : 1ppm = parts per million (백만분의 일)
1ppm = 1㎎/