NEW DELHI: Two years after it was started, India's National Air Quality Index (NAQI) does not provide a reliable picture of pollution in cities. The index uses colours ranging from dark green to dark red to show users at a glance how polluted the air in their area is at any time. However, it is unreliable because most cities don't have enough monitoring stations, and the existing stations do not monitor for all important pollutants.
Not enough stations
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What’s ailing India’s air? The nation doesn’t know enough
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