After two green days on Wednesday and Thursday that offered some respite to Mumbaikars from poor air quality, Mumbai’s Air Quality Index (AQI) climbed to 127 on Friday, January 30, placing it in the ‘moderate’ (yellow) category. Friday also ranked among the five worst AQI days recorded so far this January. PM10 was the worst pollutant on Friday.

On Wednesday, the city recorded an AQI of 70 — the lowest this month — falling in the ‘satisfactory’ category. This was followed by an AQI of 94 on Thursday, which also remained in the satisfactory range. On both these days, CO2 was the worst pollutant.