Overview
- The southwest monsoon withdrew from Mumbai over the weekend, producing clear, hot and humid conditions that led the IMD to issue a yellow heat alert for Mumbai and Thane on Monday.
- Official observatories recorded unusually high maxima with Santacruz near 37.6°C and Colaba about 36.5°C, several degrees above normal for early October.
- Citywide air quality has moved from 'Good' in September to the 'Satisfactory/Moderate' band, with the CPCB SAMEER app showing AQI values in the high 80s.
- IMD scientists attribute the AQI decline to anti‑cyclonic, low‑wind conditions that limit dispersal and to resumption of construction activity that lifts dust into the air.
- The BMC has started road‑washing and launched its Air Pollution Control and Enforcement Action Plan‑2026, which can suspend polluting activities near monitors if AQI stays above 300 for three consecutive days, and the IMD expects temperatures to ease slightly after October 7.