Gas-phase reactions accelerate nitrate formation in spring and early summer in a megacity of the Sichuan Basin, China

Key Points

• Nitrate formation accelerated by gas-phase reactions during spring and early summer.
• Increased levels of nitrate were observed, especially during the growing season.
• Observational analysis across a megacity in the Sichuan Basin assessed air quality changes.
• Findings highlight the urgent need for improved air pollution control measures.