Delhi’s overall Air Quality Index (AQI) eased in the second week of December, but the city’s pollutant profile showed little change in exposure. Between December 7 and 10, AQI moved out of the ‘severe’ level in intervals , but PM2.5 concentrations stayed far above safe limits.

Data from AQI.in for the second week of December shows PM2.5 values between 80 and 100 µg/m³ for most of the period and spiking past 150 to 200 µg/m³ on several occasions. These levels breach the World Health Organization’s 24-hour guideline of 15 µg/m³. PM10 levels remained high too, fluctuating between 180 and 270 µg/m³. The graph plotted for the second week of December shows Delhi’s AQI. (Source: AQI.in)

Stronger daytime winds brought limited dispersion earlier in the week, allowing composite AQI to soften

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