Summarize the abstract of the following research paper
This research paper is about the effects of the COVID-19 pandemic on air quality in India. According to the study, there was a significant decrease in the air pollution in India during the national lockdown. The study found a reduction of around 43-72% in particulate matter (PM), nitrogen dioxide (NO2), sulfur dioxide (SO2), and carbon monoxide (CO) in several cities. Additionally, the study provides valuable insights into the potential for air quality improvement through strict interventions and reduction in human activity.
https://www.sciencedirect.com/science/article/pii/S0048969720390785
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.

### Instruction:
Summarize the abstract of the following research paper

### Input:
https://www.sciencedirect.com/science/article/pii/S0048969720390785

### Response:
This research paper is about the effects of the COVID-19 pandemic on air quality in India. According to the study, there was a significant decrease in the air pollution in India during the national lockdown. The study found a reduction of around 43-72% in particulate matter (PM), nitrogen dioxide (NO2), sulfur dioxide (SO2), and carbon monoxide (CO) in several cities. Additionally, the study provides valuable insights into the potential for air quality improvement through strict interventions and reduction in human activity.