Abstract
Using an atmospheric photochemical model, the photochemical ozonecreation potential (POCP) values of non-methane hydrocarbon(NMHC) species are studied under different NMHC/NOx ratios. The behavior of POCP values of NMHC changing with time is also discussed under the condition of higher NMHC/NOx ratios, referring to the situation of China. The following results can beobtained. Alkenes, high-reactivity alkanes and aromatics, andformaldehyde are the primary contributors of photochemicalozone; The POCP values of NMHC species vary withNMHC/NOx ratios systematically. The POCP values of highreactivity species decrease with NMHC/NOx ratio increasing,but the POCP values of low reactivity species changelittle. The POCP value for a given NMHC species varieswith time of photochemical reactions. The POCP values oflow reactivity species increase with time, but the POCPvalues of high reactivity species change little. NOx, alkenes,aromatics, and aldehydes have higher reactivity and shorterlifetimes, therefore their transportation distances arelimited and they mainly produce local pollution. Alkanes havelower chemical reactivity and longer lifetimes so that theycan transport farther distance from their sources.
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