Smog levels in China are now so bad that wearing masks has become a way of life.
Many residents say they struggle to breathe as cities are blanketed in a toxic haze.
ITV News China Correspondent Lucy Watson reports:
Russian President Vladmir Putin has said Turkey shot down a Russian warplane in order to protect its oil trade with Islamic State, adding that Russia had received more information showing that IS oil was going via Turkey.
President Putin said he did not meet his Turkish counterpart Recep Tayyip Erdogan at the climate change summit in Paris on Monday to discuss the downing of the jet, which he described as a "huge mistake".
Mr Putin's comments are the latest in the war of words between Russia and Turkey following the downing of the Russian jet near the Syrian border last week.
Russia announced at the weekend a series of economic sanctions against Turkey.
David Cameron has said the world must take action on climate change now before it is too late.
Addressing a summit in Paris, the Prime Minister said: "Instead of making excuses tomorrow to our children and grandchildren, we should be taking action against climate change today.
"What we are looking at is not difficult, it's doable, so therefore we should come together and do it."
Labour has confirmed it will allow its MPs a free vote on the decision to launch airstrikes against so-called Islamic State in Syria.
In a statement, a spokesperson for Labour leader Jeremy Corbyn said that the Shadow Cabinet will urge David Cameron to "step back from the rush to war" and hold a full two-day debate on the issue.
Today's Shadow Cabinet agreed to back Jeremy Corbyn's recommendation of a free vote on the Government's proposal to authorise UK bombing in Syria.
The Shadow Cabinet decided to support the call for David Cameron to step back from the rush to war and hold a full two day debate in the House of Commons on such a crucial national decision.
Shadow Cabinet members agreed to call David Cameron to account on the unanswered questions raised by his case for bombing: including how it would accelerate a negotiated settlement of the Syrian civil war; what ground troops would take territory evacuated by ISIS; military co-ordination and strategy; the refugee crisis and the imperative to cut-off of supplies to ISIS.
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The Shadow Cabinet has been told that nearly 100 Labour MPs would back David Cameron's proposal to begin airstrikes against Islamic State in Syria, according to ITV News Deputy Political Editor Chris Ship.
*Latest* from Shadow Cabinet: they were told more than 40% of Labour MPs would support airstrikes. <<so that means numbers would be high 90s
Labour MP John Woodcock has criticised Jeremy Corbyn's decision to poll party members over airstrikes in Syria was "completely not credible".
Mr Woodcock also said the position of the Labour leader added confusion to the debate.
Mr Woodcock, who is in favour of airstrikes, said:
If the party leader makes a call that actually throws fuel on to the fire, all it will do is distract further from the actual issue at hand which is how does the UK best defeat a group that is systematically killing, raping and enslaving everyone who does not bow down to their very precise, medievalist perversion of Islam.
He questioned how Mr Corbyn could say that the party's official position was against the strikes.
He criticised the poll - in which 75% of those asked said they opposed further intervention - claiming it excluded many Labour members who were not active on social media or email, and questioned the timing of the release of the results.
"I just imagine what Jeremy Corbyn and Diane Abbott and John McDonnell would have had to say if a past Labour leader had deployed those kind of tactics one hour before a very important meeting of the Cabinet before military intervention."
Two of Labour's most senior politicians in Scotland say that the case for airstrikes of Islamic State targets in Syria has not yet been made.
Shadow Scottish secretary Ian Murray says he doesn't think a bombing campaign would have an impact on the so-called Islamic State - sometimes referred to as Isil or Daesh, and he said Scottish Labour leader Kezia Dugdale supports his view.
Mr Murray told the BBC in Scotland:
I don't think the case has been made because I don't think the bombing of Syria will make any difference to the position of Isil/Daesh.
Kez doesn't think that the case has been made either.
Lindsey German, a political activist with the Stop the War Coalition, said on Twitter she was sorry to hear Labour MPs would have a free vote, adding the Prime Minister was more likely now to win support for a bombing campaign in Syria.
Former Respect MP George Galloway has called Jeremy Corbyn's decision to allow the Labour Party a free vote on Syria a "moral error of grave magnitude."
Mr Galloway said: "I am sorry to say Jeremy Corbyn has made a fateful tactical, strategical and moral error of grave magnitude.
"It will, alas, mean that the bombs falling on Syria will be Labour-Tory bombs. Cameron's war made possible via a free vote of Labour MPs.
I am sorry to say @jeremycorbyn4pm has made a fateful tactical strategical and moral error of grave magnitude.
It will alas mean that the bombs falling on Syria will be Labour-Tory bombs. Cameron's War made possible via a "free vote" of Labour MPs