Air pollution control strategies aim to reduce the levels of primary pollutants, but unexpectedly induce changes in atmospheric photochemistry. This may create favorable condition for the photodegradation of atmospheric Benzo(a) pyrene (BaP), leading to new environmental challenges because of the more toxic derivatives. Based on the field observations from 1998 to 2021 at Tsuen Wan (TW) and Central & Western District (CWD) sites in Hong Kong, Coupling detrended fluctuation analysis (CDFA) has been applied to quantitatively describe the photodegradation degree of BaP in real atmosphere. From the temporal evolution process, it has been discovered that BaP photodegradation exhibits a significant increase trend since 2019 in Hong Kong. Correlation analysis shows that degree of BaP photodegradation is positively correlated with factors (T, RH, hv, O and NO/NO), while is negatively correlated with factor (PM/PM). Due to the impact of sea salt aerosols, the effect of O and NO on BaP photodegradation at CWD site is less significant than that at TW site. Furthermore, the relative contribution of major atmospheric oxidants NO and O to BaP photodegradation in real atmosphere has been determined. The results suggest that contribution of NO to BaP photodegradation is greater than that of O, and the contribution of O is gradually increasing in Hong Kong. This work has discovered a new environmental effect that may be caused by air pollution control strategies. New insights have significant implications for improving ecological risk assessment.
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