An air quality index (AQI) between zero 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".
On Friday,15 Nov, the Delhi government banned private BS III petrol and
BS IV diesel vehicles, prohibited the entry of interstate non-electric-CNG
buses, certain categories of construction activities and staggered government
office timings, as the city choked under 'severe'-category air pollution.
The restrictions were imposed under stage III of
the Graded Response Action Plan (GRAP) announced by the Commission for Air
Quality Management (CAQM) on Thursday.
Delhi recorded a minimum temperature of 15.3 degree Celsius, 1.8 notch
above the season's average, the India Meteorological Department said.
The weather department has predicted mainly clear sky with smog or
shallow fog likely in the morning or night on Saturday. The maximum temperature
is likely to settle around 33 degrees Celsius. The humidity at 8.30 am was 94
per cent.
Private BS III petrol and BS IV diesel vehicles
were banned from roads with violations inviting a penalty of Rs 20,000. Diesel
and petrol inter-state buses from the NCR cities to Delhi are also banned.