From the Document: "Air quality is negatively impacted by environmentally unsound practices, such as open burning or other suboptimal waste management methods; thus, adhering to environmentally sound practices for waste management, and maintaining high environmental standards and enforcement is essential. [...] Studies and data show unprecedented reduction in air pollution, especially Nitrogen Oxides (NOx), and atmospheric particulate matter that have a diameter of less than 2.5 micrometers (PM2.5), in countries affected by reduced economic activity as a result of measures to reduce the spread of COVID-19 [coronavirus disease 2019]. These decreases and any short-term benefits that may derive come with major health, economic and social costs."
COVID-19 Waste Management Factsheet No. 6
UN Environment Document Repository: https://wedocs.unep.org/