Table 32.3 - Importance of precursor changes for various oxidising and acidic compounds and visibility
Source: Grennfelt et al, 1993
Precursors | Episodic ozone | Average ozone | Average OH | Average H2O2 | SO2/SO42= | NOx/NO3 | NH3/NH4+ | Visibility |
---|---|---|---|---|---|---|---|---|
CH4 | + | +++ | | +++ | weak | medium | 0 | + |
CO | + | + | | +++ | weak | medium | 0 | + |
NMVOC* | +++ | + | weak | weak | ++ | medium | 0 | ++ |
NOx | strong(+/) | +++ | +++ | | ++ | strong | medium | ++ |
SO2 | 0 | 0 | 0 | | strong | 0 | strong | strong |
NH3 | 0 | 0 | 0 | 0 | weak | weak | strong | weak |
Notes:
* NMVOC = non-methane VOC.
The sign of the relationship is indicated by +/ meaning that, when the precursor emission increases, the concentration of the different compounds or visibility increases/decreases.