Yongtao Hu

TL;DR: This work explores the nonlinear responses of ozone to emissions of its precursors, nitrogen oxides (NOx) and volatile organic compounds, and introduces a method for applying second-order direct sensitivity method to assess the uncertainty of sensitivity and source apportionment estimates arising from uncertainty in an emissions inventory.

TL;DR: In this paper, the authors investigated variations in the relative sensitivity of surface ozone formation in summer to precursor species concentrations of volatile organic compounds (VOCs) and nitrogen oxides (NOx) as inferred from the ratio of the tropospheric columns of formaldehyde to nitrogen dioxide (the "Ratio") from the Aura Ozone Monitoring Instrument (OMI).

TL;DR: In this paper, the authors quantify the impact of aircraft emissions on regional air quality, especially in regards to PM2.5 and ozone, using the Emissions and Dispersion Modeling System (EDMS).

TL;DR: In this paper, the COVID-19 outbreak in China led to dramatic changes in human activities resulting from the sudden infection prevention and control measures, using ground-level observations and model simulators.

TL;DR: In this article, the decoupled direct method (DDM) and DDM-3D have been implemented in air quality models in order to efficiently compute sensitivities, particularly for species responses to emissions of their "parent" precursor.