[Photochemical Mechanism and Control Strategy Optimization for Summertime Ozone Pollution in Yining City]

Area of Science:

• Atmospheric Chemistry: Investigating ozone (O₃) formation mechanisms and precursor sensitivities.
• Environmental Science: Analyzing air pollution control strategies for urban environments.

Context:

• Ozone pollution is a significant environmental issue in northwestern China.
• Yining City experiences high levels of ozone during summer, necessitating targeted control strategies.
• Previous studies lacked detailed chemical mechanism modeling for this region.

Purpose:

• To explore the formation mechanism of ozone (O₃) in Yining City.
• To quantify ozone-VOCs-NOₓ sensitivity using the MCMv3.3.1 chemical mechanism.
• To formulate precise ozone emission reduction strategies for the region.

Summary:

• Alkenes, oxygenated volatile organic compounds (OVOCs), and aromatics were identified as major anthropogenic ozone precursors.
• Local photochemical production and export processes significantly influence ozone variations.
• The city operates under a transitional, nearly VOCs-limited photochemical regime, indicating the need for synergistic NOₓ and VOCs emission reductions.

Impact:

• Provides critical insights into ozone formation pathways and precursor contributions in northwestern China.
• Offers data-driven policy recommendations for effective ozone pollution control in Yining City and similar regions.
• Highlights the importance of integrated emission reduction strategies for improving air quality.