diff --git a/specification/maps/data-plane/Weather/stable/1.1/weather.json b/specification/maps/data-plane/Weather/stable/1.1/weather.json
index efabfa0f600d..31491de2c462 100644
--- a/specification/maps/data-plane/Weather/stable/1.1/weather.json
+++ b/specification/maps/data-plane/Weather/stable/1.1/weather.json
@@ -3584,7 +3584,7 @@
         "globalIndex": {
           "type": "number",
           "format": "float",
-          "description": "Provides an internationally standardized way to understand the concentration of pollutants in the air. Ratings range from 0 to 300 and up, with higher numbers representing worse air quality. The pollutants measured includes PM2.5, PM10, NO2, SO2, CO, and O3."
+          "description": "Represents a normalized global air quality index aligned with international scientific standards, including World Health Organization (WHO) guidelines and U.S. EPA AQI definitions.\n\nThe value reflects overall air quality based on measured pollutant concentrations, where the pollutant posing the greatest potential health impact determines the final index value.\n\nThe returned value uses an AQI-style range from 0 to 250+ and maps to defined air quality categories.\n\nThe dominant pollutant is the pollutant with the highest individual index value.\n\nFor example, if pollutant index values are:\n<ul><li><b>VOCs</b>: 10</li><li><b>PM2.5</b>: 25</li><li><b>PM10</b>: 30</li><li><b>NO&#8322;</b>: 50</li></ul>\n\nThe resulting <B>globalIndex</B> value is <B>50</B>, and the dominant pollutant is <b>NO&#8322;</b>.\n\nAir quality categories associated with the index value are:\n<ul><li><b>0-20</b>: Excellent</li><li><b>21-50</b>: Fair</li><li><b>51-100</b>: Poor</li><li><b>101-150</b>: Unhealthy</li><li><b>151-250</b>: Very unhealthy</li><li><b>251+</b>: Dangerous</li></ul>"
         },
         "dominantPollutant": {
           "$ref": "#/definitions/DominantPollutant",
@@ -3629,7 +3629,7 @@
         "globalIndex": {
           "type": "number",
           "format": "float",
-          "description": "Provides an internationally standardized air quality rating from 0 to 300 and above, with higher numbers indicating worse air quality. The index measures pollutants such as PM2.5, PM10, NO2, SO2, CO, and O3."
+          "description": "Represents a normalized global air quality index aligned with international scientific standards, including World Health Organization (WHO) guidelines and U.S. EPA AQI definitions.\n\nThe value reflects overall air quality based on measured pollutant concentrations, where the pollutant posing the greatest potential health impact determines the final index value.\n\nThe returned value uses an AQI-style range from 0 to 250+ and maps to defined air quality categories.\n\nThe dominant pollutant is the pollutant with the highest individual index value.\n\nFor example, if pollutant index values are:\n<ul><li><b>VOCs</b>: 10</li><li><b>PM2.5</b>: 25</li><li><b>PM10</b>: 30</li><li><b>NO&#8322;</b>: 50</li></ul>\n\nThe resulting <B>globalIndex</B> value is <B>50</B>, and the dominant pollutant is <b>NO&#8322;</b>.\n\nAir quality categories associated with the index value are:\n<ul><li><b>0-20</b>: Excellent</li><li><b>21-50</b>: Fair</li><li><b>51-100</b>: Poor</li><li><b>101-150</b>: Unhealthy</li><li><b>151-250</b>: Very unhealthy</li><li><b>251+</b>: Dangerous</li></ul>"
         },
         "dominantPollutant": {
           "$ref": "#/definitions/DominantPollutant",
@@ -3669,7 +3669,7 @@
         "globalIndex": {
           "type": "number",
           "format": "float",
-          "description": "Internationally normalized air quality rating on a scale from 0 to 300 and up, with higher numbers representing worse air quality."
+          "description": "Represents a normalized global air quality index aligned with international scientific standards, including World Health Organization (WHO) guidelines and U.S. EPA AQI definitions.\n\nThe value reflects overall air quality based on measured pollutant concentrations, where the pollutant posing the greatest potential health impact determines the final index value.\n\nThe returned value uses an AQI-style range from 0 to 250+ and maps to defined air quality categories.\n\nThe dominant pollutant is the pollutant with the highest individual index value.\n\nFor example, if pollutant index values are:\n<ul><li><b>VOCs</b>: 10</li><li><b>PM2.5</b>: 25</li><li><b>PM10</b>: 30</li><li><b>NO&#8322;</b>: 50</li></ul>\n\nThe resulting <B>globalIndex</B> value is <B>50</B>, and the dominant pollutant is <b>NO&#8322;</b>.\n\nAir quality categories associated with the index value are:\n<ul><li><b>0-20</b>: Excellent</li><li><b>21-50</b>: Fair</li><li><b>51-100</b>: Poor</li><li><b>101-150</b>: Unhealthy</li><li><b>151-250</b>: Very unhealthy</li><li><b>251+</b>: Dangerous</li></ul>"
         },
         "concentration": {
           "$ref": "#/definitions/WeatherUnit",