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From:Atmospheric Chemistry and Physics (Vol. 22, Issue 8) Peer-ReviewedDelhi is one of the world's most polluted cities, with very high concentrations of airborne particulate matter. However, little is known about the factors controlling the characteristics of wide-range particle number...
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From:Atmospheric Chemistry and Physics (Vol. 21, Issue 24) Peer-ReviewedNitrous acid, HONO, is a key net photolytic precursor to OH radicals in the atmospheric boundary layer. As OH is the dominant atmospheric oxidant, driving the removal of many primary pollutants and the formation of...
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From:Atmospheric Chemistry and Physics (Vol. 21, Issue 17) Peer-ReviewedThe Indian megacity of Delhi suffers from some of the poorest air quality in the world. While ambient NO.sub.2 and particulate matter (PM) concentrations have received considerable attention in the city, high...
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From:Atmospheric Chemistry and Physics (Vol. 21, Issue 15) Peer-Reviewed
PM.sub.1 composition and source apportionment at two sites in Delhi, India, across multiple seasons.
Air pollution in urban environments has been shown to have a negative impact on air quality and human health, particularly in megacities. Over recent decades, Delhi, India, has suffered high atmospheric pollution, with... -
From:Atmospheric Chemistry and Physics (Vol. 20, Issue 9) Peer-Reviewed
Nitrous acid (HONO) emissions under real-world driving conditions from vehicles in a UK road tunnel.
Measurements of atmospheric boundary layer nitrous acid (HONO) and nitrogen oxides (NO.sub.x) were performed in summer 2016 inside a city centre road tunnel in Birmingham, United Kingdom. HONO and NO.sub.x mixing ratios... -
From:Atmospheric Measurement Techniques (Vol. 13, Issue 3) Peer-ReviewedWe present an instrument for the measurement of total ozone reactivity - the reciprocal of the chemical lifetime of ozone (O.sub.3) - in the troposphere. The Total Ozone Reactivity System (TORS) was developed with the...
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From:Atmospheric Measurement Techniques (Vol. 12, Issue 12) Peer-ReviewedNitrous acid (HONO) is a key determinant of the daytime radical budget in the daytime boundary layer, with quantitative measurement required to understand OH radical abundance. Accurate and precise measurements of HONO...
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From:Atmospheric Measurement Techniques (Vol. 13, Issue 11) Peer-ReviewedNitrogen oxides (NOx=NO+NO2) are critical intermediates in atmospheric chemistry and air pollution. NO.sub.x levels control the cycling and hence abundance of the primary atmospheric oxidants OH and NO.sub.3 and regulate...
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From:Atmospheric Chemistry and Physics (Vol. 21, Issue 8) Peer-ReviewedIsoprene is the most important biogenic volatile organic compound in the atmosphere. Its calculated impact on ozone (O.sub.3) is critically dependent on the model isoprene oxidation chemical scheme, in particular the way...
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From:Atmospheric Measurement Techniques (Vol. 12, Issue 11) Peer-ReviewedIn September 2017, we conducted a proton-transfer-reaction mass-spectrometry (PTR-MS) intercomparison campaign at the CESAR observatory, a rural site in the central Netherlands near the village of Cabauw. Nine research...
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From:Atmospheric Chemistry and Physics (Vol. 21, Issue 3) Peer-ReviewedMeasurements of OH, HO.sub.2, complex RO.sub.2 (alkene- and aromatic-related RO.sub.2) and total RO.sub.2 radicals taken during the integrated Study of AIR Pollution PROcesses in Beijing (AIRPRO) campaign in central...
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From:Atmospheric Measurement Techniques (Vol. 9, Issue 6) Peer-ReviewedNitrous acid (HONO) has been quantitatively measured in situ by differential photolysis at 385 and 395 nm, and subsequent detection as nitric oxide (NO) by the chemiluminescence reaction with ozone...
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From:Atmospheric Measurement Techniques (Vol. 11, Issue 2) Peer-ReviewedByline: Leigh R. Crilley, Marvin Shaw, Ryan Pound, Louisa J. Kramer, Robin Price, Stuart Young, Alastair C. Lewis, Francis D. Pope To access, purchase, authenticate, or subscribe to the full-text of this article,...
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From:Atmospheric Measurement Techniques (Vol. 13, Issue 11) Peer-ReviewedAtmospheric HONO mixing ratios in indoor and outdoor environments span a range of less than a few parts per trillion by volume (pptv) up to tens of parts per billion by volume (ppbv) in combustion plumes. Previous HONO...
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From:Atmospheric Chemistry and Physics (Vol. 20, Issue 22) Peer-ReviewedPolycyclic aromatic hydrocarbons (PAHs) are ubiquitous pollutants in air, soil, and water and are known to have harmful effects on human health and the environment. The diurnal and nocturnal variations of 17 PAHs in...
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From:Atmospheric Chemistry and Physics (Vol. 18, Issue 15) Peer-Reviewed
Recent field studies have suggested that sea-salt particulate nitrate (NITs) photolysis may act as a significant local source of nitrogen oxides (NO.sub.x) over oceans. We present a study of the global impact of this...
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From:Atmospheric Chemistry and Physics (Vol. 17, Issue 6) Peer-ReviewedWe present 2Â years of NO.sub.x observations from the Cape Verde Atmospheric Observatory located in the tropical Atlantic boundary layer. We find that NO.sub.x mixing ratios peak around solar noon (at 20-30...
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From:Atmospheric Chemistry and Physics (Vol. 20, Issue 23) Peer-ReviewedWintertime in situ measurements of OH, HO.sub.2 and RO.sub.2 radicals and OH reactivity were made in central Beijing during November and December 2016. Exceptionally elevated NO was observed on occasions, up to â¼250...