Air Pollution Tolerance Index (APTI) Calculator R package APTIcalc version 0.1.1 It calculates the Air Pollution Tolerance Index (APTI) of plant species using biochemical parameters such as chlorophyll content, leaf extract pH, relative water content, and ascorbic acid content. It helps in identifying tolerant species for greenbelt development and pollution mitigation studies. It includes a 'shiny' app for interactive APTI calculation and visualisation. For method details see, Sahu et al. (2020).<DOI:10.1007/s42452-020-3120-6>. Software Depends: R (>= 3.5.0) Imports: shiny, ggplot2 Suggests: roxygen2, knitr, rmarkdown, testthat (>= 3.0.0) Nobin Chandra Paul <ncp375@gmail.com> Comprehensive R Archive Network (CRAN) Nobin Chandra Paul [aut, cre, cph], Rupali Singh [aut, cph], Sangram B Chavan [aut, cph], Navyasree Ponnaganti [aut, cph], K. Sammi Reddy [aut, cph] GPL (>= 2.0) 2025-12-03 application/tgz https://CRAN.R-project.org/package=APTIcalc doi:10.32614/CRAN.package.APTIcalc