κατὰ τὴν κλίμακα τὴν ὑφ' ἡμῶν χρωμένην (1) τὸ τοῦ ἀέρος μίασμά ἐστιν 52.
(1)The United States Environmental Protection Agency (EPA) has developed an index called the Air Quality Index which they use to report daily air quality. This AQI is divided into six categories indicating increasing levels of health concern. An AQI value over 300 represents hazardous air quality whereas if it is below 50 the air quality is good.
I am writing in Ancient Greek not because I know Greek well, but because I hope that it will improve my fluency in reading. I got the idea for this from Adrianus over on the Latin forum here at Textkit.