China's meteorological authority has introduced a new weather warning system for smog which will use readings of PM 2.5, a particle pollutant.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/china-uses-pm-25-weather-alert-system
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/china-daily
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/china
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/atmosphere-and-ozone-layer
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution-control
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pm-25
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/weather-predictions