Environment Minister Prakash Javadekar said pollution is caused by many factors and the survey took cognisance of only air pollution and that is why India's ranking in Yale University report has come down.
"Actually, there are 20 indicators to judge pollution like access to drinking water, access to sanitation, waste water treatment, agricultural subsidies, pesticides regulation, change in forest cover, coastal shelf forest pressure, fish stalks, etc.
Appreciating concerns expressed by members, the Minister said no one should forget that vehicle population has grown from eight crore on roads to 16 crore vehicles on roads. So, it has doubled in ten years.
Javadekar said the country needed upgradation of diesel, which is a different decision, besides required to give more emphasis to public transport and such other things.
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The Minister expressed concern over increase use of diesel despite the gap between the prices of petrol and diesel being reduced.
"So, we are hoping that people will also switch over to petrol vehicles which cause less pollution. As regards diesel also, standards can be upgraded now and that can be done. It is a good suggestion for consideration," he said.
Javadekar said government is measuring pollution, particularly air quality, in at least 240 cities and is giving emphasis on use of public transport.
The Minister said government has changed diesel norms. So, the lead and sulphur contents have gone down and it was asking all state governments as well as the corporations concerned to take care of that.