Yes, greenhouse gas emissions have declined 6% owing to coronavirus lockdowns.

https://www.dailymail.co.uk/sciencetech/article-8250601/Greenhouse-gas-emissions-drop-coronavirus-lockdowns-NOT-stop-climate-change.html

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Preprint Coronavirus (COVID-19) the environment is recovering and the...

https://www.aljazeera.com/indepth/inpictures/pictures-coronavirus-exposes-impact-air-pollution-200422132607593.html

https://www.timesofisrael.com/scientists-in-italy-find-coronavirus-on-air-pollution-particles/

COVID-19 pandemic has resulted in numerous impacts on the environment and the climate. The severe decline has caused many regions to experience a drop in air pollution. lockdowns and other measures resulted in a 25 per cent reduction in carbon emissions and 50 percent reduction in nitrogen oxides emissions.

Just go through these paper and you get lot of references.

Best,

Perhaps the only positive of the COVID19 is that it has an important effect in maintaining environmental balance.

This is a positive effect of Coronavirus. However, it is only temporary as soon the world will open up and pollution status will return to its previous state as countries strive to regain economic stability.

Yes, nature is healing itself now. It will be our duty to maintain the health of the environment in future.

Arvind Singh says "greenhouse gas emissions have declined 6%". Zulfiqar Ali says: "25 per cent reduction in carbon emissions and 50 percent reduction in nitrogen oxides emissions".

Could you give references?

Thank you

Ref Wikipedia.org

Images from the NASA Earth Observatory show a stark drop in pollution in Wuhan, China, when comparing NO2 levels in early 2019 (top) and early 2020 (bottom).[1]

Covid 19 is obviously reducing the SO2, NO2 pollution according to some recent satellite images. But in a Chinese study, it was concluded that it will back to where it was before once the lockdown restrictions are lifted.

Following.