We used low-cost Fairsense PMS1003 sensors to monitor exposure to multiple air pollutants: PM 2.5, PM 10, SO 2, CO, O 3 and NO 2, across four dominant transport modes: bike, taxi, subway and bus, on prescribed commuting routes covering a wide range of environments representative of downtown Zhengzhou during the morning and evening rush hours.
PMS1003 begins to deviate from the previous ambient value is indicated by the broken line in the figure”. No. This refers to the increase in the PMS1003 reading from its steady value at low RH values. There is a 80% increase between a RH of 75% and 88%, hence the ratio 1.8.