The number of monitoring stations in Delhi has grown from seven to 36 in last five years. This means that Delhi’s average AQI the day after Diwali in 2015, for instance, represents data from only seven localities, while the average AQI the day after Diwali this year represents about five times more localities, making a comparison between the two defective.
from Hindustan Times - delhi https://ift.tt/2q3oTSj
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