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. The nocturnal nitrogen oxides, which include the nitrate radical (NO 3 ),dinitrogen pentoxide (N 2 O 5 ), and its uptake product on chloridecontaining aerosol, nitryl chloride (ClNO 2 ), can have profound impactson the lifetime of NO x ( = NO  +  NO 2 ), radical budgets, andnext-day photochemical ozone (O 3 ) production, yet their abundances andchemistry are only sparsely constrained by ambient air measurements. Here, we present a measurement data set collected at a routine monitoringsite near the Abbotsford International Airport (YXX) located approximately30 km from the Pacific Ocean in the Lower Fraser Valley (LFV) on the westcoast of British Columbia. Measurements were made from 20 July to 4 August2012 and included mixing ratios of ClNO 2 , N 2 O 5 , NO,NO 2 , total odd nitrogen (NO y) , O 3 , photolysis frequencies,and size distribution and composition of non-refractory submicron aerosol(PM 1 ). At night, O 3 was rapidly and often completely removed by dry depositionand by titration with NO of anthropogenic origin and unsaturated biogenichydrocarbons in a shallow nocturnal inversion surface layer. The lownocturnal O 3 mixing ratios and presence of strong chemical sinks forNO 3 limited the extent of nocturnal nitrogen oxide chemistry at groundlevel. Consequently, mixing ratios of N 2 O 5 and ClNO 2 were low(  30 and  100 parts-per-trillion by volume (pptv) andmedian nocturnal peak values of 7.8 and 7.9 pptv, respectively). Mixingratios of ClNO 2 frequently peaked 1–2 h after sunriserationalized by more efficient formation of ClNO 2 in the nocturnalresidual layer aloft than at the surface and the breakup of the nocturnalboundary layer structure in the morning. When quantifiable, production ofClNO 2 from N 2 O 5 was efficient and likely occurredpredominantly on unquantified supermicron-sized or refractory sea-salt-derived aerosol. After sunrise, production of Cl radicals from photolysis ofClNO 2 was negligible compared to production of OH from the reaction ofO( 1 D) + H 2 O except for a short period after sunrise.

Low levels of nitryl chloride at ground level: nocturnal nitrogen oxides in the Lower Fraser Valley of British Columbia