Reduced Air Pollution during the Prevailing of COVID-19 Pandemic: Five Years Observation and Path Analysis in the Fenwei Plain, Northwest China

Table 1

Annual average of meteorological factors in the study area for 2016–2020.

	2016	2017	2018	2019	2020
Temperature (°C)	14.8	15.2	14.9	14.7	14.1
Relative humidity (%)	68.2	67.1	68.0	68.7	68.0
Wind speed (m/s)	1.6	1.6	1.6	1.1	1.8