保留正斜槓，並使用打包打包的時間曲線打上標

Question

如何在R中保留正斜槓？

舉例來說，我需要保持斜線，使3標，

... 
ylab = "PM2.5 Concentration [ug/m3]/ Device Humidity [%]", 
name.pol = c("PM2.5 Concentration [ug/m3]", "Device Humidity [%]"), 
... 

我自動得到這樣的結果，

斜槓在米具有前已被刪除（不是我想要的）。

3是上標（我想要的）。

任何想法？

編輯：

  timePlot(allData, 
       pollutant = c("particle_concentration", "humidity"), 
       avg.time = mean, 
       lwd = 2, 
       lty = 1, 
       ylab = "PM2.5 Concentration [ug/m3]/ Device Humidity [%]", 
       xlab = siteData$description, 
       name.pol = c("PM2.5 Concentration [ug/m3]", "Device Humidity [%]"), 
       cols = c("blue", "orange"), 
       type = "site", 
       group = TRUE) 

Answer 1

集auto.text = FALSE和使用plotmath：

library(openair) 
timePlot(mydata, pollutant = "nox", 
     ylab = expression(paste("PM2.5 Concentration ", group("[", mu*g/{m^3}, "]"), "/ Device Humidity [%]")), 
     auto.text = FALSE)