This week, millions of Americans are anxiously scanning air quality maps focusing on two colors: red and purple. Red indicates "unhealthy" air quality, and purple? "Very unhealthy." When did purple ...

In a world where we rely on Google Maps to get everywhere, from the nearest chai tapri to a road trip in the mountains, it’s hard to imagine life before those tiny coloured lines told us where to turn ...

COVID-19 across California is really, really bad. How bad? Purple-tier bad. California, along with Ohio and Colorado, employs a color-coded system to warn about the prevalence of the Coronavirus. The ...