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Ozone (O 3) pollution poses health risks and premature mortality, and gas stations are one of the largest sources of urban volatile organic compounds (VOCs, the main precursor to O 3). This paper investigates whether the government's call for night refueling, which can be regarded as a green nudge, can guide changes in consumer behavior and consequently improve environmental quality. Using a difference-in-differences (DID) estimation and weekly monitoring site air quality panel data, we analyze the effect of the Night Refueling Preferential Policy on O 3 concentrations. We find that the policy can reduce O 3 concentrations by 10% by encouraging consumers to refuel at night. The reduction in O 3 has brought great benefits to human health, leading to a 4–5‰ reduction in non-accidental mortality and a 6–8‰ reduction in cardiovascular mortality in Jiangsu province. The economic benefits of this policy would be approximately 62–189 billion Chinese Yuan (CNY) if it were implemented nationwide. The findings of this study suggest that the government can influence consumer behavior to promote environmental quality. [Display omitted] • The government's call for night refueling can reduce O3 concentration by 9% by drawing consumers to refuel at night. • The Night Refueling Preferential Policy can reduce non-accidental and cardiovascular death rates by 3–4‰ and 5–7‰. • The Night Refueling Preferential Policy can bring 57–174 billion CNY in economic benefits if it is implemented nationwide. [ABSTRACT FROM AUTHOR]