Air pollution levels have dropped significantly in India owing to the nationwide lockdown imposed in the wake of the Novel Coronavirus outbreak. The country has seen a massive dip in vehicular movement and industrial activity, which have resulted in clean and fresh air perhaps in decades. NASA satellite sensors have observed aerosol levels at a 20-year low for this time of the year in parts of northern India. Aerosols are tiny solid and liquid particles suspended in the air that reduce visibility and can cause damage to human lungs and heart. Around this time every year, aerosols from anthropogenic sources add to air pollution levels in several Indian cities.
“We knew we would see changes in atmospheric composition in many places during the lockdown. But I have never seen aerosol values so low in the Indo-Gangetic plain at this time of year,” Pawan Gupta, a Universities Space Research Association (USRA) scientist at NASA’s Marshall Space Flight Center, was quoted as saying.
India’s Central Pollution Control Board (CPCB) too has recently reported an improvement in air quality in the country. CPCB data suggests a nearly 71% fall in nitrogen dioxide levels. Several major cities have witnessed a fall in the Air Quality Index (AQI).
The National Green Tribunal (NGT), India’s environment watchdog, has also confirmed that the nationwide lockdown has improved the air quality. “The major sectors contributing to air pollution are transport, industries, power plants, construction activities, biomass burning, road dust resuspension and residential activities. In addition, certain activities such as operation of DG sets, restaurant, landfill fires, etc. also contribute to air pollution,” said NGT in an official statement to an Indian news agency.
The lockdown in the wake of the COVID-19 pandemic has ensured that most of these activities have been halted, resulting in clean and fresh air. While scientists expect aerosol levels to increase slightly in the upcoming weeks in parts of India as seasonal dust storms begin, we must not lose the only positive that can be extracted out of this ongoing crises.