Ng-if should change color of indoor-temp according to co2 level, but doesnt work

Hi Lorenzo and thx 4 your help.

Yes, in OH2 its a number-item:

Number netatmo_phy_innen_co2 "CO2" <carbondioxide> { channel = "netatmo:NAMain:netatmoBridge:70ee5xxxxxxx:Co2" }

Removing the ’ didnt have any effect…my template looks exactly the same as before:

<tr>
		<td id="weather-temp" align="CENTER"><font font size="30"><b>{{'%.1f' | sprintf:itemValue('netatmo_phy_aussen_temp')}}</b></font></td>
		<td id="weather-temp-sign">°C</td>		
		<td rowspan="2"><img id="weather-icon" src="{{ServerPath}}/images/{{IconSet}}/{{itemValue('Condition0').replace(' ','-') | lowercase }}.png"/></td>
		
		<div ng-if="itemValue('netatmo_phy_innen_co2')<=600">
			<td  id="weather-temp" align="RIGHT"><font font size="30" color="green"><b>{{'%.1f' | sprintf:itemValue('netatmo_phy_innen_temp')}}</b></font></td>
		</div>		
		<div ng-if="itemValue('netatmo_phy_innen_co2')>600&&<=800">
			<td  id="weather-temp" align="RIGHT"><font font size="30" color="#FE9A2E"><b>{{'%.1f' | sprintf:itemValue('netatmo_phy_innen_temp')}}</b></font></td>
		</div>		
		<div ng-if="itemValue('netatmo_phy_innen_co2')>800">
			<td id="weather-temp" align="RIGHT"><font font size="30" color="red"><b>{{'%.1f' | sprintf:itemValue('netatmo_phy_innen_temp')}}</b></font></td>
		</div>
		
		<td id="weather-temp-sign">°C</td>	
	</tr>