Wednesday, December 07, 2016

Infographic - Choked in Delhi Dust


Infographic by Hindustan Times

Air Quality in Delhi (daily updates)

This is modeled source contributions to the ambient particulate pollution (PM2.5) in South Delhi district (one of the 14 districts in the National Capital Region (NCR) of Delhi). The calculations are conducted in forecast mode. More NCR district reports @ Delhi Air Quality.Info



  • DUST.ERO = wind blown dust from the dry and arid regions, dependent of hourly meteorological conditions
  • OPEN.FIRES = open biomass burning (both agricultural lands and forest areas), a seasonal affair linked to dry conditions and agricultural clearing patterns
  • TRANS.PASS = contribution of passenger vehicles (2Ws, 3Ws, 4Ws, Taxis, and Buses)
  • TRANS.FRGT = contribution of freight vehicles (heavy and light trucks, and non-road vehicles)
  • RD.DUST = contribution of re-suspended dust on the roads due to vehicle movement and construction activities
  • PP.DGS = contribution of power plants and in-situ diesel generator sets
  • INDUS = contribution of industrial activities
  • HOUS.HLD = contribution of domestic cooking, space heating, water heating, and lighting
  • WST.BURN = contribution of open waste burning
  • OTHERS = contribution of aviation, shipping, biogenics, etc..
A number of source apportionment studies were conducted in Delhi (more in Delhi than in any of the other Indian cities). We summarized the known particulate pollution source apportionment studies, as an open article, "what's polluting Delhi's air". A snapshot of the shares from one of the studies is presented below.

The modeled particulate pollution in the forecast mode for the next three days is presented, as time series for SO2 and Ozone for the district and as an animation for all PM2.5 covering the modeling domain. Similar animations and daily average concentration maps for all the criteria pollutants are available @ Delhi Air Quality Info





See what is happening at the regional scale, which is conducted as part of the all India air pollution forecasting program, hosted @ http://www.indiaairquality.info. The animation below is from a WRF-CAMx simulation conducted @ 0.25x0.25 degree resolution (approximately, 25km x 25km).


The pollution patterns change every hour and every day, depending on the prevalent meteorological conditions - wind speed, wind direction, temperature, and precipitation. Under windy conditions, most of the emissions get dispersed to farther places; Under rainy conditions, most of the emissions get drained out. Want to see how the weather pattern is holding up for the next three days in Delhi. Check out @ http://www.delhiairquality.info. Below is an animation of the anticipated wind speeds and wind directions from the WRF meteorological model - also used by IMD for their forecasts.

The monitoring data from the DPCC stations reported as an air quality index by AQICN is as follows for one of the stations

Saturday, November 26, 2016

CPCB - Hike Parking Fees 4 times if Air Quality Severe

The Central Pollution Control Board has recommended to the Supreme Court that parking fee in Delhi/NCR be hiked 3-4 times when air quality is in the "severe" or "very poor" category between October and February. For "severe" and "very poor" levels in the winter months, CPCB has recommended 17 action points. The same interventions will be taken up if the air quality is "severe" or "very poor" between March and May.

Besides suggesting that RWAs provide electric heaters to security guards to avoid open burning of waste or biomass, CPCB also called for a complete ban on fireworks and impounding of visibly polluting vehicles. These recommendations were part of CPCB's "graded-responsibility action plan" submitted to the SC on Friday to tackle air pollution. It also said that, as a special measure, a task force on air pollution could recommend additional measures, such as closure of schools, along with other action points depending on the severity of levels.

CPCB recommended that a task force be constituted with representatives from CPCB, ministry of environment and forests, Delhi Pollution Control Committee and Indian Meteorological Department and health experts who will oversee the implementation of this graded responsibility plan. CPCB also mentioned agencies responsible for enforcing these action points. For example, the municipal commissioners of Delhi and NCR will be responsible for hiking the parking fee when the air quality worsens, while DPCC and other NCR state pollution control boards will communicate air pollution levels and alerts through newspapers and TV.

Read the full article @ Times of India

Read our commentary on taking the long view of air pollution in Delhi