The primary objective of the study is to analyse the relationship between COVID-19 and nitrogen dioxide in New York City during the global pandemic. Notably, the study has investigated the direct influence of lockdown circumstances (due to COVID-19) and plunge in the population of New York on its environmental contamination. The study utilized the Non-Linear Autoregressive Distributed Lag (NARDL) model to ascertain the asymmetric impact of COVID-19 on the environmental quality of the USA. The results reveal that lockdown has played a significant role in the environmental quality of the USA. Notably, an escalation in the registered cases of COVID-19 has a meaningful and indirect relationship with environmental pollution in the UAS. Besides, as the lockdown state goes normal, it results in an explosion in the environmental pollution in the USA. Also, deaths due to COVID-19 substantively improve the environmental quality in the short-term period as well as in the long-term period.

中文翻译：

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衡量纽约的空气质量：COVID-19 与二氧化氮排放之间的非线性关系

该研究的主要目的是分析全球大流行期间纽约市 COVID-19 与二氧化氮之间的关系。值得注意的是，该研究调查了封锁情况（由于 COVID-19）的直接影响以及纽约人口的暴跌对其环境污染的影响。该研究利用非线性自回归分布式滞后 (NARDL) 模型来确定 COVID-19 对美国环境质量的不对称影响。结果表明，封锁对美国的环境质量发挥了重要作用。值得注意的是，登记的 COVID-19 病例的升级与 UAS 中的环境污染有着有意义的间接关系。此外，随着封锁状态的正常化，它导致美国的环境污染爆炸式增长。还，