As per recent data collected from air quality monitoring stations in five places across the country show the historic site has become highly polluted.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/lumbini-%E2%80%93-birthplace-buddha-nepal-faces-serious-threat-pollution
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/zee-news
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pm-25
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/nepal
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/unesco
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/lung-disease
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/kathmandu
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/respiratory-diseases