China will set more stringent targets for improving the nation's air quality under a new three-year plan, as Beijing prepares to beef up a nationwide crackdown on polluters in its campaign to clear its notoriously toxic skies.

The new targets for concentrations of small, breathable particles known as PM2.5 will be lower than those in the country's current five-year plan that was due to end in 2020, Environment Minister Li Ganjie said at a briefing on the sidelines of the country's annual parliament on Saturday.

In January, the Ministry of Environmental Protection (MEP) said it was drawing up plans for tougher curbs on smog during the next three years to 2020 after a five-year crackdown on pollution helped it attain air quality targets in December.