TABLE 1.
Research and selection protocol
| A Database | ||||
|---|---|---|---|---|
| A1. | ScienceDirect | |||
| A2. | Scopus | |||
| B Search criteria | ||||
| B1. | Journal | All | ||
| B2. | Year | All | ||
| B3. | Article type | All | ||
| B4. | Date of search | 10th November 2020 | ||
| C Keywords for papers identification | ||||
| Group A | Group B | |||
| COVID‐19 | Air pollution | |||
| Lockdown | Air quality | |||
| SARS‐CoV‐2 | AND | Environmental impact | ||
| NO2 | ||||
| PM10 | ||||
| D Steps for material selection | ||||
| D1. | Duplicate removal | |||
| D2. | Keywords and highlights assessment | |||
| D3. | Application of inclusion criteria on the content of the text | |||
| D3.1 | Treats the air quality of specific areas | OR | ||
| D3.2 | Assess the effect of COVID‐19 | OR | ||
| D3.3 | It evaluate the results quantitatively | |||
| D4. | Full text assessment | |||
| E Other paper sources | ||||
| E1. | From informal approach | |||
| E2. | From browsing method | |||
| F Descriptive analysis | ||||
| Year | ||||
| Journal | ||||
| Country type | ||||
| Research paper | ||||
| Review | ||||
| Others | ||||
| G Case studies analysis | ||||
| Location of the case studies | Location of the case studies | |||
| Impact of lockdown on logistics and industrial/economic activities | Impact of lockdown on logistics and industrial/economic activities | |||