Levels of air pollutants and warming gases over some cities and regions are showing significant drops as coronavirus impacts work and travel.
Researchers in New York told the BBC their early results showed carbon monoxide mainly from cars had been reduced by nearly 50% compared with last year.
Read MoreAir pollution has started to fall in many UK cities in response to the lockdown measures introduced as a result of the coronavirus crisis.
The trend mirrors that seen across continental Europe as people have spent less time in vehicles, offices and factories and more time at home.
Read MoreThe world's largest lockdown means all factories, markets, shops, and places of worship are now closed, most public transport suspended and construction work halted, as India asks its citizens to stay home and practice social distancing. So far, India has more than 1,300 confirmed cases of Covid-19, including 35 deaths.
Already, data shows that the main cities are recording much lower levels of harmful microscopic particulate matter known as PM 2.5, and of nitrogen dioxide, which is released by vehicles and power plants.
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