Dear Transport Minister, you are holding back state governments from implementing an effective emissions inspection programme for in-use vehicles in cities. If you fail to act even now when you are reviewing the ineffectual PUC norms and test procedures to develop an improved emissions testing system, state governments will be forced to carry on with the charade of PUC – as in Delhi today. This will only lead to more public harassment with no improvement in the city’s air.

Mr Minister, give city governments a clear roadmap: CSE

Dear Shri Khanduri,
We are appalled to note that even 10 years after introducing the pollution under control (PUC) certificate scheme, your ministry has failed to evaluate the effectiveness of the scheme. Nor have you charted a roadmap to improve its efficacy. On the contrary, you have actively encouraged the state governments to continue this farce -- at huge cost to the exchequer.

Recently, the Delhi government has announced yet another drive to enforce greater PUC compliance. This is the only strategy available to the Delhi government to control emissions from a large and ageing vehicle fleet. City governments are not legally empowered to modify standards and test procedures that are urgently needed to make the inspection system truly effective. Setting standards and test procedures is your responsibility – we urge you to swiftly move towards developing meaningful vehicle inspection procedures.

Michael P Walsh & Lennart Erlandsson

All that the Delhi government’s current compliance drive will achieve is to equip more than three million registered vehicles with an ineffectual PUC certificate. The PUC system has only been given a facelift by adding a few gizmos – a Web camera for automatic imaging of number plates and computerised data recording that aims to make the system `fool proof’. But your ministry has never explained how such cosmetic upgrades address the basic limitations of the current PUC test procedures or overcome the dismally lax standards designed by your ministry that compromise the quality of tests.

Few commercial diesel vehicles fail the PUC system

This is possible because of extremely inadequate test procedures and in-use standards that have never been changed since 1992. Worse, the standards are same and lax for all categories of vehicles, irrespective of age and level of technology. Naturally, vehicles rarely fail PUC tests. In its PUC test data collected from 13 PUC stations in Delhi from June to August 2002, CSE found that the average failure rate to be less than 10 per cent. Unbelievably, not a single diesel bus failed the PUC test, the result of inappropriate testing methods and standards that fail to detect even the gross polluters.

CSE therefore initiated a technical evaluation of the entire PUC inspection system. We invited two noted international experts: Michael P Walsh, a US-based expert who has helped many governments around the world design strategies to control vehicular emissions; and Lennart Erlandsson of Motor Test Centre, Sweden, who has been involved in the pioneering work on vehicle inspection to present a framework of vehicle inspection programme for Delhi. The experts recommended a phased vehicle inspection plan to replace the ineffectual PUC. CSE has presented this plan to the Delhi transport minister.

But this plan can only be implemented if improved test procedures and corresponding standards are immediately adopted for all vehicles, particularly commercial vehicles and two wheelers.

We would like to bring the following to your notice:

• PUC norms do not vary for different technology levels: The experts’ study shows that a simple idle test as currently conducted may still identify malfunctioning systems in carburetted vehicles. But newer cars equipped with defective electronic fuel injection systems and catalytic converters that cause higher emissions, will never show up in the current idle CO test. It is therefore vital to introduce improved test methods for such vehicles (for example, test measurements on high idle speed or a loaded test).

  Tailpipery: Probe remains ineffectual

• Appropriate tests have not been designed to measure particulate emissions from diesel vehicles: The current tests for diesel vehicles do   not adequately measure deadly particulate emissions, of grave health concern in the city. Evidence shows that the current smoke opacity tests are not representative of particulate emissions from diesel vehicles. Only loaded mode tests with particulate matter standards can verify particulate levels. CSE recommends the Ministry of Road Transport and Highways to immediately develop loaded mode tests conducted on a dynamometer – a treadmill type of device used to simulate driving speeds on roads to measure emissions. Without such test procedures, it is not possible to measure other pollutants like NOx and particulate matter from on-road vehicles.

• Even the PUC norms that the ministry is reviewing would require drastic revisions till the new system is phased-in. Hardly any vehicle will fail the ministry’s lenient PUC norms: The proposed hydrocarbon norms, for petrol cars without catalytic converters at 1,500 ppm (parts per million); 750 ppm for those with catalytic converters; and 9,000 ppm for two-stroke two-wheelers, are too lenient. Experience with similar technologies in the West shows that idle hydrocarbon emissions from a petrol car fitted with a catalytic converter must never exceed 100 ppm.

• It is meaningless to test only idle emissions without also measuring key testing parameters to verify the accuracy of the PUC tests: For

  Recommended test procedure

  instance, measuring oxygen and carbon dioxide in addition to CO and hydrocarbons will indicate whether the exhaust emissions have been deliberately diluted by allowing more air at the time of testing. Similarly, measuring the lambda value (air-fuel ratio) in vehicles with advanced fuel injection systems and catalytic converters is necessary to check the efficacy of the vehicle’s sensors and catalytic converters. Similarly, it is important to measure the oil temperature in diesel vehicles to determine optimal engine temperature for conducting the smoke opacity test.

• Consumers will not benefit from the emissions warranty provided voluntarily by manufacturers if the current PUC system continues: Any vehicle inspection system should be capable of detecting manufacturing defects in the emissions control systems, such as in catalytic converters. Only then can we have a successful manufacturers’ warranty and recall programme. This will also hold manufacturers accountable.

a PUC booth

State governments have few strategies available to control emissions from in-use vehicles. The Delhi government has taken important steps in capping the age of commercial vehicles and converting the old fleet of diesel buses, three-wheelers and taxis to CNG, which have considerably cleaned Delhi’s air. But there are still no immediate emissions control strategies for millions of diesel trucks, commercial vehicles, two-wheelers and diesel cars.

Even the Supreme Court is pushing the Delhi government towards a better inspection regime. In its July 28, 1998 ruling, the Court mandated the Delhi government to move towards a comprehensive inspection and maintenance programme. With no improvement in sight, the Court in its February 14, 2003 order directed the Environment Pollution (Prevention and Control) Authority to examine Delhi’s PUC system. Despite such interventions, the Delhi government has no legal provisions to establish more efficient emissions norms and test procedures. The people of Delhi are looking to your ministry to take the lead in this matter.