Delhi recorded a moderate Air Quality Index (AQI) of 165 at 9 am on Thursday, October 15, according to data from the Central Pollution Control Board (CPCB). Meanwhile, Singapore experienced a significantly worse air quality situation, with an AQI of 287, categorized as unhealthy due to smoke from Indonesian wildfires affecting the region.
The AQI readings highlight a stark contrast between the two cities' air quality on the same day. Singapore's pollutant levels included PM2.5 concentrations of 116 micrograms per cubic metre and PM10 levels of 164 micrograms per cubic metre, along with carbon monoxide at 1,611 parts per billion, sulphur dioxide at 1 ppb, nitrogen dioxide at 2 ppb, and ozone at 10 ppb. Delhi’s AQI of 165 places it in the moderate category under India’s CPCB classification, which ranges from 101 to 200 for moderate air quality.
This comparison underscores the regional impact of Southeast Asia’s wildfire season, which has caused significant haze and pollution spikes in Singapore. Delhi’s moderate AQI contrasts with Singapore’s unhealthy rating, reflecting differences in air quality monitoring systems and pollutant levels. The PM2.5 particles, which are fine particles less than 2.5 micrometres in diameter, are a key factor in assessing health risks related to air pollution in both cities.
The Central Pollution Control Board continues to monitor Delhi’s air quality closely as the city braces for potential GRAP (Graded Response Action Plan) curbs to manage pollution levels. The next official AQI update for Delhi is expected later today, providing further insight into the evolving air quality situation.