Union Environment Minister has said that that air
quality in Delhi-NCR has improved. The number of “poor” air quality days have decreased
from 300 in 2014 to 206 in 2018. Further, the number of days with ‘moderate’ to
‘good’ air quality has increased from 108 in 2016 to 159 in 2018.
An Air Quality Index (AQI) between 0 and 50 is
considered ‘good’, 51 and 100 ‘satisfactory’, 101 and 200 ‘moderate’, 201 and
300 ‘poor’, 301 and 400 ‘very poor’, and 401 and 500 ‘severe’
The AQI classifies air quality of a day
considering criteria pollutants through colour codes and air quality
descriptor. Further, it also links air quality with likely human health
The index measures eight major pollutants, namely,
particulate matter (PM 10 and PM 2.5), nitrogen dioxide, sulphur dioxide,
ozone, carbon monoxide, ammonia and lead.
In Delhi-NCR, the government has taken number of
steps to combat the rising menace of air pollution.
The Union environment Ministry has notified Graded
Response Action Plan (GRAP) for the NCR. Under GRAP, there are 4 stages of
pollution – Moderate to Poor, Very Poor, Severe and Severe+ or Emergency and
action are listed that need to be undertaken as the levels are breached.
Further, a Comprehensive Action Plan (CAP) has
been put forward. CAP lists medium and long-term actions for all pollution
sources for Delhi and NCR.
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