Noida: After having “moderate” air quality three days, Noida on Thursday entered the “poor” category due to change in weather conditions in the past 24 hours. While Ghaziabad and Greater Noida are already under “poor”, pollution monitoring agencies expect the region to either remain under this category or slip further into the “very poor” category, with poor ventilation conditions.
Noida had been seeing ‘moderate’ air quality since January 4 due to the rains that washed away the pollutants.
“The wind direction has changed and so the speed has dropped, and so did the temperature. On Thursday, the wind speed was around eight kmph and the humidity was also high. Given such weather conditions, the wind speed should have been at least 15 kmph to stop the air quality from worsening. For two days the ventilation conditions will be almost the same as on Thursday. However, wind speeds will pick up to almost 25 kmph from January 9,” said Kuldeep Srivastava, head, regional weather forecasting centre, India Meteorological Department (IMD).
According to the Central Pollution Control Board (CPCB), the air quality index (AQI) of Noida on a scale of 0 to 500, on Thursday was 236 or “poor” against 200 or “moderate” a day earlier.
Greater Noida’s AQI was 288 against 239 a day earlier. The AQI of Ghaziabad was 294 against 234 a day earlier, both “poor”.
The major pollutant PM2.5 levels also worsened to more than twice the standards.
The PM2.5 levels in Noida worsened to 121.75 microgrammes per cubic metres (µg/m3) against 102.02µg/m3 a day earlier. The PM2.5 for Greater Noida was 129.51µg/m3 on Thursday against 110.97µg/m3 a day earlier. The PM2.5 level for Ghaziabad was 137.08µg/m3 against 106.86 a day earlier. The safe standard for PM2.5 is 60µg/m3.
According to the System of air quality and weather forecasting and research (SAFAR), the AQI will remain within the “poor” category with moderate ventilation conditions.
“Ventilation condition is moderate and AQI is expected to stay in the “poor” category for tomorrow (Friday). The AQI is likely to marginally improve on January 9 and 10. No sudden deterioration of AQI is expected in the next few days,” said the SAFAR statement on Thursday.
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