Here’s how BMTC is trying to keep emission levels in check


This article is part of a special series: Air Quality in our Cities

Five out of 15 Bengaluru Metropolitan Transport Corporation (BMTC) buses that the Regional Transport Office officials from the Transport Department had randomly inspected had failed the emission tests.That was in 2016.

Recent reports said that BMTC bus breakdowns have considerably reduced compared to previous years due to an improvement in their maintenance procedures.

Would that also mean that there is an improvement in BMTC buses following emission standards? What are the measures taken by BMTC to ensure that their buses follow emission norms? What are the external measures present to ensure that this happens?

Maintenance procedures to comply with emission norms

Several measures are detailed in the note shared by BMTC with Citizen Matters, on maintenance steps taken to ensure that emission levels of their buses are within norms. They include:

  • usage of service air indicator which presents a red band when the air filter chokes
  • the primary filter replaced after a second red band indication and the safety filter after a third red band indication
  • replacing various parts of the engine (Diesel Exhaust Fuel Filter, DEF Air Oil Separator, DEF pump filter) after they have a traveled a specific number of kilometers depending on the type of bus;
  • and cleaning of silencer many times every ten days.

Regular and surprise inspections of maintenance work at the depots are conducted by officers from the zonal and central level.

Emission testing for BMTC

As per Transport Department’s rules, BMTC needs to check the emission levels of all its vehicles once in every six months. BMTC has 13 depots that have online testing centres distributed across zones, says Ganga Gowda (Chief Technical Officer, BMTC). The results from these tests are recorded in the server hosted by the Transport Department.

A senior official with the Mechanical Department of BMTC said that in addition to the emission tests conducted every six months, buses are tested on a monthly basis at their respective depots. If the buses don’t clear the emission tests during either of the two testing processes, the vehicle is withdrawn and necessary maintenance work is performed.

BMTC buses going from Majestic Bus stand towards K R Circle. Pic: Shree D N

Ganga Gowda mentions that BMTC buses are regularly inspected for emission levels on route and in depots by BMTC personnel from the central office. If they are found to have violated emission norms, the information is provided to the Depot Manager to take requisite action.

BMTC goes for BS-IV buses

BMTC has been moving towards increasing its number of  Bharat Stage  IV (BS4) buses. In the past two years, over 1400 buses have been added to the fleet and over 1100 buses have been discarded. As per data provided by BMTC, they currently have 3420 buses under BS 4 norms, 3064 under BS 3 norms, 143 under BS 2 norms, while there are no buses under BS 1 norm. BMTC is also in the process of introducing 80 Electric buses in Bengaluru. All these are aimed at fuel efficiency, green fuel and reducing emission among BMTC buses.

External monitoring 

RTO officials are mandated to randomly check vehicles for Pollution Under Control (PUC) certificate. They are also assisted by Karnataka State Pollution Control Board (KSPCB) in inspecting the emission levels of vehicles through KSPCB’s  mobile emission testing centres (12 in Karnataka, and six in Bengaluru).

The Transport Department checks the calibration of BMTC’s online emission testing software randomly and once in every three years during the renewal of the centre’s license, says their Public Relations Officer (PRO).

The KSPCB receives monthly reports that include details and results of the monthly emission tests conducted. The KSPCB issues notices to BMTC in instances where there are several violations of emission norms, says KSPCB Chairman Lakshman.

The BMTC had introduced a system where citizens can report observed instances of high bus emissions levels either online or through their helpline, and be rewarded with Rs 1000 after inspection and if the levels were above the norm. The reward system currently doesn’t exist but the complaint mechanism is still present.

Lacunae in external monitoring 

While the Transport Department has the data of emission results of BMTC buses on its server, there is no monitoring mechanism in place to ensure that notices are issued to BMTC when buses don’t meet the emission norms, or when certain buses regularly fail emission tests; and that they report back to the Transport Department. A spokesperson of the Transport Department said that the only way they check if BMTC buses are following emission norms is through random inspection of PUC certificates and physical testing of emission levels.

BMTC has a feedback system that encourages citizens to report and provide feedback to BMTC when they observe heavy emissions. This is an essential form of external monitoring. However, several of the commuters and other passengers that Citizen Matters spoke to weren’t aware of the existing systems to provide feedback on BMTC services.

This article is part of a special series: Air Quality in our Cities, and explores the root causes for air pollution and solutions for improving air quality in Bengaluru and Chennai. This series has supported with a grant from Climate Trends.
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About Arjun Rajan 17 Articles
Arjun Rajan was a Research Associate at Citizen Matters.