diff --git a/stat_vars/manual_aqicn_stat_vars.mcf b/stat_vars/manual_aqicn_stat_vars.mcf
index e71b919c..fabdb821 100644
--- a/stat_vars/manual_aqicn_stat_vars.mcf
+++ b/stat_vars/manual_aqicn_stat_vars.mcf
@@ -1,3 +1,24 @@
+Node: dcid:Min_Concentration_AirPollutant_Ammonia
+typeOf: dcs:StatisticalVariable
+populationType: dcs:Atmosphere
+measuredProperty: dcs:concentration
+statType: dcs:minValue
+pollutant: dcs:Ammonia
+
+Node: dcid:Median_Concentration_AirPollutant_Ammonia
+typeOf: dcs:StatisticalVariable
+populationType: dcs:Atmosphere
+measuredProperty: dcs:concentration
+statType: dcs:medianValue
+pollutant: dcs:Ammonia
+
+Node: dcid:Max_Concentration_AirPollutant_Ammonia
+typeOf: dcs:StatisticalVariable
+populationType: dcs:Atmosphere
+measuredProperty: dcs:concentration
+statType: dcs:maxValue
+pollutant: dcs:Ammonia
+
 Node: dcid:Min_Concentration_AirPollutant_Ozone
 typeOf: dcs:StatisticalVariable
 populationType: dcs:Atmosphere