Ariyalur, the land of fossils, is found to be embedded with rich limestone deposits. Hence around 9 cement factories have been established in and around Ariyalur. This becomes one of the source of air pollution in this area.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/ambient-air-quality-terms-nitrogen-nox-and-around-ariyalur-perambalur-dt-tamil-nadu
[2] http://admin.indiaenvironmentportal.org.in/category/author/m-vasanthy
[3] http://admin.indiaenvironmentportal.org.in/category/author/m-jeganathan
[4] http://admin.indiaenvironmentportal.org.in/category/journal/pollution-research
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/industrial-pollution
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/nitrogen-dioxide
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-quality-monitoring
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/aerosols
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/cement-industry
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/india
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/tamil-nadu
[13] http://admin.indiaenvironmentportal.org.in/category/thesaurus/perambalur-d