Knowledge-guided machine learning reveals pivotal drivers for gas-to-particle conversion of atmospheric nitrate by Bo Xu, Haofei Yu, Zongbo Shi, Jinxing Liu, Yuting Wei, Zhongcheng Zhang, Yanqi Huangfu, Han Xu, Yue Li, Linlin Zhang, Yinchang Feng, Guoliang Shi

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Optofluidic Formaldehyde Sensing: Towards On-Chip Integration by Daniel Mariuta, Arumugam Govindaraji, Stéphane Colin, Christine Barrot, Stéphane Le Calvé, Jan G. Korvink, Lucien Baldas, Jürgen J. Brandner

“…Miniaturization of analytical systems towards palm-held devices has the potential to provide more efficient and more sensitive tools for real-time monitoring of this hazardous air pollutant. This work presents the initial steps and results of the prototyping process towards on-chip integration of HCHO sensing, based on the Hantzsch reaction coupled to the fluorescence optical sensing methodology. …”
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A simplified non-linear chemistry transport model for analyzing NO₂ column observations: STILT–NO_<i>x</i> by D. Wu, J. L. Laughner, J. Liu, J. Liu, P. I. Palmer, P. I. Palmer, P. I. Palmer, J. C. Lin, P. O. Wennberg, P. O. Wennberg

“…<p>Satellites monitoring air pollutants (e.g., nitrogen oxides; <span class="inline-formula">NO_<i>x</i></span> <span class="inline-formula">=</span> <span class="inline-formula">NO</span> <span class="inline-formula">+</span> <span class="inline-formula">NO₂</span>) or greenhouse gases (GHGs) are widely utilized to understand the spatiotemporal variability in and evolution of emission characteristics, chemical transformations, and atmospheric transport over anthropogenic hotspots. …”
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High-resolution inventory of atmospheric emissions from transport, industrial, energy, mining and residential activities in Chile by N. Álamos, N. Huneeus, N. Huneeus, M. Opazo, M. Opazo, M. Osses, M. Osses, S. Puja, N. Pantoja, N. Pantoja, H. Denier van der Gon, A. Schueftan, A. Schueftan, R. Reyes, R. Calvo, R. Calvo

“…In general, emissions of anthropogenic air pollutants and <span class="inline-formula">CO₂</span> in northern Chile are dominated by mining activities as well as thermoelectric power plants, while in central Chile the dominant sources are transport and residential emissions. …”
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Measurement report: The 10-year trend of PM_2.5 major components and source tracers from 2008 to 2017 in an urban site of Hong Kong, China by W. S. Chow, K. Liao, X. H. H. Huang, K. F. Leung, A. K. H. Lau, J. Z. Yu, J. Z. Yu

“…<p>Fine particulate matter (PM<span class="inline-formula">_2.5</span>) remains a major air pollutant of significant public health concern in urban areas. …”
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Detecting nitrogen oxide emissions in Qatar and quantifying emission factors of gas-fired power plants – a 4-year study by A. Rey-Pommier, A. Rey-Pommier, F. Chevallier, P. Ciais, P. Ciais, J. Kushta, T. Christoudias, I. S. Bayram, J. Sciare

“…<p>Nitrogen oxides <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M2" display="inline" overflow="scroll" dspmath="mathml"><mrow><mo>(</mo><mrow class="chem"><msub><mi mathvariant="normal">NO</mi><mi>x</mi></msub></mrow><mo>=</mo><mrow class="chem"><mi mathvariant="normal">NO</mi></mrow><mo>+</mo><mrow class="chem"><msub><mi mathvariant="normal">NO</mi><mn mathvariant="normal">2</mn></msub></mrow><mo>)</mo></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="93pt" height="13pt" class="svg-formula" dspmath="mathimg" md5hash="79a4e6d4a679c46f41fa8ce5cb168f13"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="acp-23-13565-2023-ie00001.svg" width="93pt" height="13pt" src="acp-23-13565-2023-ie00001.png"/></svg:svg></span></span>, produced in urban areas and industrial facilities (particularly in fossil-fuel-fired power plants), are major sources of air pollutants, with implications for human health, leading local and national authorities to estimate their emissions using inventories. …”
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A Low-Cost Wireless Sensor Network for Barn Climate and Emission Monitoring—Intermediate Results by David Janke, Michael Bornwin, Kobe Coorevits, Sabrina Hempel, Philippe van Overbeke, Peter Demeyer, Aditya Rawat, Arnout Declerck, Thomas Amon, Barbara Amon

“…The goal of this study was to investigate a developed low-cost online tool for monitoring barn climate and air pollutant emissions (OTICE) in naturally ventilated barns. …”
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Examining TROPOMI formaldehyde to nitrogen dioxide ratios in the Lake Michigan region: implications for ozone exceedances by J. J. M. Acdan, R. B. Pierce, R. B. Pierce, A. F. Dickens, Z. Adelman, T. Nergui

“…<p>Surface-level ozone (<span class="inline-formula">O₃</span>) is a secondary air pollutant that has adverse effects on human health. …”
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Summertime response of ozone and fine particulate matter to mixing layer meteorology over the North China Plain by J. Wang, J. Gao, F. Che, X. Yang, Y. Yang, L. Liu, Y. Xiang, H. Li

“…We highlight that the correlation between MLH and secondary air pollutants should be treated with care in hot weather, and the superposition-composite effects of PM<span class="inline-formula">_2.5</span> and O<span class="inline-formula">₃</span> along with the evolution of mixing layer should be considered when developing PM<span class="inline-formula">_2.5</span>–O<span class="inline-formula">₃</span> coordinated control strategies.…”
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Measurement report: Atmospheric nitrate radical chemistry in the South China Sea influenced by the urban outflow of the Pearl River Delta by J. Wang, J. Wang, J. Wang, H. Wang, H. Wang, H. Wang, Y. J. Tham, Y. J. Tham, L. Ming, Z. Zheng, Z. Zheng, G. Fang, C. Sun, C. Sun, C. Sun, Z. Ling, Z. Ling, Z. Ling, J. Zhao, J. Zhao, J. Zhao, S. Fan, S. Fan, S. Fan

“…<p>The nitrate radical (NO<span class="inline-formula">₃</span>) is a critical nocturnal atmospheric oxidant in the troposphere, which widely affects the fate of air pollutants and regulates air quality. Many previous works have reported the chemistry of NO<span class="inline-formula">₃</span> in inland regions of China, while fewer studies target marine regions. …”
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Chemical ionization mass spectrometry utilizing ammonium ions (NH₄⁺ CIMS) for measurements of organic compounds in the atmosphere by L. Xu, L. Xu, M. M. Coggon, C. E. Stockwell, C. E. Stockwell, J. B. Gilman, M. A. Robinson, M. A. Robinson, M. A. Robinson, M. Breitenlechner, M. Breitenlechner, A. Lamplugh, A. Lamplugh, A. Lamplugh, J. D. Crounse, P. O. Wennberg, P. O. Wennberg, J. A. Neuman, J. A. Neuman, G. A. Novak, G. A. Novak, P. R. Veres, S. S. Brown, S. S. Brown, C. Warneke

“…This instrument was deployed in the RECAP campaign (Re-Evaluating the Chemistry of Air Pollutants in California) in Pasadena, California, during summer 2021. …”
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