Adding NO2 during COVID-19 charticle card

Author: IGRiosTC

charticles.html

@@ -88,6 +88,7 @@
                 <h1>Charticles</h1>
                 <p>Bite-size articles with a chart or a map. Choose a charticle from the following list to open in a new window, the latest ones are presented first. <span id="filterContainer" style="display: inline-block;"></span></p>
                 <section class="cardContainer">
+                    <a class="card labBorder" href="https://www.trafforddatalab.io/charticles/2020-04-30-no2-covid-19/" target="_blank"><span class="filterTags"><!-- air pollution nitrogen dioxide coronavirus covid-19 lockdown --></span><h2 class="cardHead themeLink">Air pollution levels during COVID-19</h2><img src="https://www.trafforddatalab.io/charticles/2020-04-30-no2-covid-19/plot.svg" alt=". Air pollution levels in Trafford during the COVID-19 lockdown compared to 2018 and 2019 levels."/></a>
                     <a class="card labBorder" href="https://www.trafforddatalab.io/charticles/2019-11-13-green-flags/" target="_blank"><span class="filterTags"><!-- green flags parks awards --></span><h2 class="cardHead themeLink">Green Flag Awards</h2><img src="https://www.trafforddatalab.io/charticles/2019-11-13-green-flags/plot.svg" alt=". Parks across Greater Manchester awarded a Green Flag, 2019."/></a>
                     <a class="card labBorder" href="https://www.trafforddatalab.io/charticles/2019-11-12-living-wage/" target="_blank"><span class="filterTags"><!-- living wages employment jobs deprivation poverty working --></span><h2 class="cardHead themeLink">Living wage</h2><img src="https://www.trafforddatalab.io/charticles/2019-11-12-living-wage/plot.svg" alt=". Jobs below the living wage in each Local Authority within Greater Manchester, 2017 - 2018."/></a>
                     <a class="card labBorder" href="https://www.trafforddatalab.io/charticles/2019-11-11-alcohol-related-deaths/" target="_blank"><span class="filterTags"><!-- alcohol related deaths drinking unhealthy --></span><h2 class="cardHead themeLink">Alcohol-related deaths</h2><img src="https://www.trafforddatalab.io/charticles/2019-11-11-alcohol-related-deaths/plot.svg" alt=". Deaths from alcohol related conditions in each Local Authority within Greater Manchester, 2017."/></a>