In plants,air pollution causes

The $BOD$ limit prescribed by the Central Pollution Control Board $(CPCB)$ for the discharge of industrial and municipal wastewater into natural surface water bodies is .....

Which of the following pollutants is released in the largest quantity from the exhaust emissions of petrol/diesel automobiles?

Eutrophication is often seen in

Catalytic converters are fitted into automobiles to reduce the emission of poisonous gases. These converters use expensive metals as catalysts,which are:

In automobiles,catalytic converters change unburnt hydrocarbons into