Renamed pollutants to air quality (#7901)

* renamed pollutants to air quality

* Update demo.markdown

source/_components/air_quality.markdown

@@ -1,7 +1,7 @@
 ---
 layout: page
-title: "Air Pollutants"
-description: "Instructions on how to air pollutants sensors with Home Assistant"
+title: "Air Quality"
+description: "Instructions on how to add air quality sensors with Home Assistant"
 date: 2018-11-25 08:00
 sidebar: true
 comments: false
@@ -9,7 +9,7 @@ sharing: true
 footer: true
 ---
 
-The `air_pollutants` gather information about the air quality and pollution details.
+The `air_quality` gather information about the air quality and pollution details.
 
 The platforms cover the following levels (if they are available):
 

source/_components/air_quality.opensensemap.markdown

@@ -13,7 +13,7 @@ ha_release: 0.85
 ha_iot_class: "Cloud Polling"
 ---
 
-The `opensensemap` air pollutants platform will query the open data API of [openSenseMap.org](https://opensensemap.org/) to monitor air quality sensor station.
+The `opensensemap` air quality platform will query the open data API of [openSenseMap.org](https://opensensemap.org/) to monitor air quality sensor station.
 
 ## {% linkable_title Setup %}
 
@@ -25,7 +25,7 @@ To enable this platform, add the following lines to your `configuration.yaml` fi
 
 ```yaml
 # Example configuration.yaml entry
-air_pollutants:
+air_quality:
   - platform: opensensemap
     station_id: STATION_ID
 ```

source/_components/demo.markdown

@@ -17,7 +17,7 @@ The `demo` platform allows you to use components which are providing a demo of t
 
 Available demo platforms:
 
-- [Air Pollutants]((/components/air_pollutants/) (`air_pollutants`)
+- [Air Quality](/components/air_quality/) (`air_quality`)
 - [Alarm control panel](/components/alarm_control_panel/) (`alarm_control_panel`)
 - [Binary sensor](/components/binary_sensor/) (`binary_sensor`)
 - [Camera](/components/camera/) (`camera`)