this is bbc news. the headlines: london has become the first city in the world to introduce an ultra—low emission zone in an effort to improve air quality. drivers of polluted vehicles, welcome to bbc news, from motorbikes to lorries, broadcasting to viewers coming into the centre of the city in north america and around the globe. my name is lewis vaughanjones. will have to pay to enter the area. our top stories: president trump is replacing his homeland security secretary. striving for cleaner air kirstjen nielsen says she has in the city streets. london becomes the first in the world to charge drivers of polluting vehicles resigned with immediate effect. anger has been growing to use its roads. within the white house at the failure to reduce the number of migrants entering the us president trump announces he is replacing the woman in charge illegally across southern border. of his border policy. the secretary for homeland security, and the un—backed government kirsten nieljsen, says she has in libya says more than 20 people resigned with immediate effect. have been killed in four days of fighting around the capital, the un—backed libyan government says more than 20 people have been killed tripoli. in four days of fighting around the capital, tripoli. forces led by warlord khalifa haftar are trying to seize the city, he is the king of bollywood. in defiance of international sharukh khan tells the bbc calls for restraint. what he thinks about gender inequality in india. you are up to date

with the headlines. the world's first ultra—low emissions zone has come into force here in london. it is seen as one of the most radical anti—pollution policies in the world. polluting vehicles from motorbikes to lorries will pay a charge to drive into the centre of the city, and with air pollution in our cities such big problem, will other countries follow? tom edwards reports. this is the clean air choir, organised by mums who support the new ultra—low emissions zone. pollution is a worry. we all need to think what impact air pollution is having on our children right now, on all of us. and road transport is the major source of air pollution in london. on this map, red and yellow show the high levels of pollution near roads.

older, more polluting cars will have to pay to enter central london, with the world's first ultra—low emission zone. petrol vehicles over 1a years old and diesel vehicles over four will have to pay the charge, £12.50 every day, and it runs 21w. motorbikes and hgvs will also have to comply. and the best way to check if your vehicle is compliant is to go on the tfl vehicle checker. it'll cover the area inside the congestion charging zone, but from 2021, it'll expand to roads inside the north and south circulars, taking in thousands more vehicles. the ulez is a first step, but it's a tiny bit of london. it needs to be much, much bigger. it needs to go beyond the north and south circular. no—one should be left out of the clean air zone.

the mayor said his scheme was necessary. this is an issue of socialjustice. it is unacceptable, in the world's greatest city, we have children in the poorest parts of london who are suffering the worst air, who have permanently undeveloped lungs. and it's the poorest families who own the fewest cars. expanding the zone will face opposition, but supporters say tomorrow is a crucial step forward in cleaning up london's air. tom edwards, bbc news. i will speak now to vancouver's former chief planner. what do you make of what london is doing here? well, it's a dramatic example of something that many world cities are doing, whether it is madrid or paris oi’ doing, whether it is madrid or paris or oslo, where i have worked, or even cities like new york looking at congestion charges. there are all sorts of cities all over the world looking to address urban pollution because of the dramatic health impacts. but at the same time, addressing climate change, because many of the same solutions that

address urban pollution are part of the mitigation that we desperately need to address climate change. so if you have got this idea, and if it works, of course, here in london, targeting diesel and petrol, to try and bring down the air pollution, what other kinds of things can cities do? well, cities - i think smart cities are starting to look at multiple approaches, first of all at reducing pollution itself, particular from cars and from buildings. and we have to recognise that a lot of cities are susceptible to pollution that isn't even generated within the city. pollution comes in from other cities or even other countries. so pollution can be a very tough thing to tackle. at the same time, there are micro— solutions, looking at the way we actually design our streets, our street canyons, the tree canopy within our cities, how sunlight can actually and wind can actually defuse pollution. so you also have to look about it —— at it not only from an emissions perspective but from an emissions perspective but from the dispersion and addressing

pollution perspective. but that is of course recognising that that is about the challenge of urban pollution. climate change, greenhouse gas emissions, are going to affect us whether we can smell them, whether they are making us sick immediately or not. we're all going to be affected by greenhouse gas emissions, whether we can notice them or not. i will come back to climate change. i just them or not. i will come back to climate change. ijust want them or not. i will come back to climate change. i just want to them or not. i will come back to climate change. ijust want to pick up climate change. ijust want to pick up on the trees point. we think of trees being a good thing, you are suggesting that possibly are not. well, i want to be really careful here, because tree canopy and green roofs and living well and integration of nature into our urban settings can be one of most important ways to address air pollution. but, ironically, some studies coming out of the university of antwerp, for example, are showing that if you put trees in certain contexts, they can actually help trap pollution. so it is not... i wa nt to trap pollution. so it is not... i want to be really clear, it is not a

situation where trees are bad. trees are good. they are part of a multifaceted solution. but ironically, like anything else, we need to be smart about it and we have to look at it in the context of careful street design, community design and city design. i've got you, that was nice and clear. thank you, that was nice and clear. thank you for that. overall, you have studied cities around the world. how optimistic are you that cities have the right plans, the right ideas, to try and sort out their air pollution? well, it's hard to be optimistic about what nations are doing, frankly. but cities, many global cities and their mayors are taking the lead and doing things that are much more bold, much more aggressive, if you well. aggressive isa aggressive, if you well. aggressive is a strong word, but the nature of the claimant emergency we have requires aggressive and urgent action. so cities, ironically, are the level of government where everything hits you on the ground, and cities control transportation and cities control transportation and they control buildings, which area big and they control buildings, which are a big part of our climate footprint and our air pollution generation. but of course, again,

cities also have to be cognizant that they are being affected by air pollution from outside the city itself, so it's notjust about what individual cities can do. all cities have to be working together to address climate change and air pollution around the world. thank you very much. really interesting stuff there. next, president trump has announced that he is replacing his homeland security secretary, kirstjen nielsen. the president thanked herfor her service but gave no immediate reason for the change. mr trump said kevin mcaleenan would take over the job in an acting capacity. cbs correspondent errol barnett sent us an update from washington. president trump confirmed the ouster of his secretary of the department of homeland security sunday in a series of tweets, and rumours of kirstjen nielsen's ouster had percolated many times before.

this time, though, it's serious, and it seems to follow a weekend in which president trump has bolstered his positioning on immigration issues. in fact, the outgoing secretary, kirstjen nielsen, was side—by—side with president trump in calexico, california late last week as the president highlighted newly renovated border wall fencing, some two miles of it. the president also, over the weekend, said the us is full, its immigration system overloaded. one other thing the president has threatened to do in recent days is scrap the united states' asylum system along the southern border altogether. now, while it's unclear if that will even happen, it would need congressional approval, it is part of a tougher direction for the president when it comes to immigration and border security issues. kirstjen nielsen, in fact, was grilled by the house homeland security committee in march for a perceived poor treatment of migrant families at the border.

democrats, newly emboldened with their oversight responsibility, have put a spotlight on kirstjen nielsen and her action as the secretary of the department of homeland security. president trump announcing that, for right now, she will be replaced by the commissioner of the customs and border protection entity, kevin mcaleenan. he becomes acting secretary of dhs. errol barnett from cbs. i'll have more on this story in a few minutes. let's get some of the day's other news: us secretary of state mike pompeo has called for an immediate halt to the fighting in libya between rebel forces and those of the internationally recognised government. more than 20 people are reported to have died in the clashes over the last four days, and the un has called for an urgent truce. libya has been torn by violence and instability since colonel gaddafi was deposed and killed in 2011. dozens of militias operate there, linked either to the un—backed

government, under the prime minister, fayez al—sarraj, which has struggled to assert control, or the rebel libyan national army, led by general khalifa haftar. since thursday, it has advanced on the capital, tripoli. our diplomatic correspondent james landale has more. this is a battle fought largely by pick—up truck, makeshift armoured vehicles jamming the routes in and out of tripoli. these belong to militias loyal to the government of national accord, that's backed by the united nations. and they're rushing to defend the capital. a government spokesman insisted they had slowed the advance of rebel forces. translation: on this day, the libyan armed forces declare the launch of the operation, volcano of anger, to purge all libyan cities of aggressor

and illegitimate forces. these are the aggressive forces he's talking about, from the so—called libyan national army — the loose alliance of armed groups that control much of the east and south of libya — here preparing for battle at their benghazi headquarters. today, as these forces continued to head west, there were clashes south of tripoli, particularly around the disused international airport. and there were also reports of air strikes by both sides. the un mission in libya called for a short truce to evacuate civilians, but was ignored. the government said 21 people have been killed and 27 wounded. so why does the crisis in libya matter? well, ever since western forces helped depose colonel gaddafi in 2011, libya has been gripped by violence and political instability. the un has attempted to broker a political deal between general haftar and prime minister sarraj,

but so far it's failed, and the fear among western governments is that full—blown civil war could mean libya once again becomes a source of migration and extremism on europe's southern flank. haftar clearly believes that there's a military solution to this conflict. he believes that, if he captures tripoli, he doesn't have to negotiate politically. but this is a big gamble, and it's certainly unclear whether it's going to be successful. at the moment, it's in the balance, but it looks like it's unlikely for his forces to succeed. some countries are now acting to protect their nationals. these unverified pictures appear to show the united states evacuating some of its forces by hovercraft. eu foreign ministers will discuss the crisis in brussels tomorrow, but few expect the fighting to end soon. james landale, bbc news. in a week that indians go to the polls, pakistan has warned its neighbour not to launch any new attack, after saying it had reliable intelligence that one was being planned.

india has denied the accusation. in the meantime, pakistan says it has released 100 indian prisoners. most of them are fishermen convicted of straying into pakistani waters. ramzan karmali reports. the day has finally come for these fishermen. they are going home. pakistan released 100 indian fishermen as a goodwill gesture. the fishermen formed the first batch of 260 indian prisoners pakistan said it will release this month. they were convicted of straying into pakistani waters. understandably, there was a huge sense of relief. translation: i'm very excited to be going back to my home country after 17 months. i'm so excited to see my parents, my brother, my sister, my whole family. but, on the same day, pakistan's foreign ministry also accused india of planning an attack later this month.

it says it has reliable intelligence. translation: recently, the cabinet committee on security was held, which was chaired by indian prime ministe modi. heads of three armed forces, who participated in the meeting, said we are ready for action against pakistan. pakistan's foreign ministry said ambassadors of the permanent members of the un security council in islamabad had been alerted about the situation, but india denied it was planning an attack. it described the accusation as irresponsible and preposterous. an indian foreign office spokesperson said pakistan had a clear objective of whipping up war hysteria in the region. the two countries came close to war in february after a suicide bombing in indian—administered kashmir, that killed a0 indian troops. pakistan has always denied any responsibility for that attack,

but india responded with airstrikes on its neighbour's territory. soon after, pakistan shot down an indian jet. with 900 million votes up for grab in india's elections, which start later this week, all eyes will be on how prime minister modi reacts to the pakistani accusations. ramzan karmali, bbc news. stay with us on bbc news. still to come: we will hear from the man who has just completed the longest journey in an electric car, through a total of 33 countries. 25 years of hatred and rage as theyjump up on the statue. this funeral became a massive demonstration of black power, a power to influence.

today, it's about the promise of a bright future. a day when we hope a line can be drawn under the bloody past. i think that picasso's works were beautiful, they were intelligent, and it's a sad loss to everybody who loves art. this is bbc world news. i'm lewis vaughan jones. the latest headlines: london has become the first city in the world to charge polluting vehicles for using its roads. president trump announces he's replacing the woman in charge of his border policy.

the secretary for homeland security, kirsten nieljsen, says she's resigned with immediate effect. more on that story now. eric ham is a political analyst in washington. he told me why he thought president trump took this step. well, you have to understand, president trump's biggest campaign issue was actually building a border wall and keeping migrants from the southern border out of the united states and, unfortunately, he was unable to get the money for the wall and we still see a growing number of refugees, migrants fleeing from central america, coming into the united states and, unfortunately, he simply was not happy with kirstjen nielsen's ability to actually secure that border. just six months into the position, she was berated by the president at one of the cabinet secretary level meetings, and so she has just been a key cabinet member who has

been in the crosshairs, in the firing line of this president for quite some time. also it is important to know that one of the president's closest and most influential senior advisers, mr mueller...miller, he also simply was not happy with her and, of course, jared kushner, the president's son—in—law, also weighted in. jared kushner, the president's son—in—law, also weighted in. so the knives were out and, like i say, it was only a matter of time before she would be on her way out. yeah, it was definitely miller, not mueller, as one of trump's advisers there... yes. ..that would be very complicated. so what do you think happens next? does donald trump double down on his border policy? we have seen the president actually moving in that way. remember it was just recently the president withdrew his nominee to head the immigration customs enforcement agency. in addition to that, remember the president in addition to that, remember the president is still looking for money

for the wall and, at the same time, the president is seeking to move into a campaign footing. and so now the president has to nominate someone who can actually get through a contentious nomination battle and that is going to be very difficult especially considering you have a number of members in the us senate who are also looking for re—election efforts and so this issue of immigration and the border wall now becomes front and centre at a time when you have key candidates who are running on the democratic side, namely beto o'rourke and joaqhin castro, who are running for president who i think can speak very clearly to this issue. and so now the president is i think on the defence. he's the bollywood star with millions of fans around the world and now shah rukh khan can also boast an honorary doctorate from the university of law in london. it's to honour his

work in philanthropy. in an exclusive interview with the bbc, the star says gender inequality in india is narrowing. the bbc asian network's shabnam mahmood reports. known as the king of bollywood, shah rukh khan is one of indian cinema's biggest stars and one of the highest—paid actors in the world. more used to receiving film awards, he's now being given an honorary doctorate for his work in philanthropy. thank you very much. it is so little i could have done in a lifetime. genuinely, i want to live to be 100 years so that i can... now i'm 50. ..i can dedicate the next 50 years doing something worthwhile. and, you know, when i meet people around the world, i meet some youngsters, some old people, they will turn around and they say, "you know what, yourfilms make us happy." and that is very encouraging

but i want to make people happy now, personally. over the years, he's championed equality for women. so, have things changed in the industry following the me too movement, which saw women standing up to sexual harassment globally? the roles of women and the kind of attitude that you have at workplace for women is changing for the positive. but i think overall, when i see some of the actresses get the kind of roles, and even salaries, which i think should be even more equal than it is right now, i think it's very heartening. however, there are some things shah rukh khan feels don't need changing, like the film censorship laws in india. i think lots of positive stuff for female actors. i have always believed that most of my career i

look to the women i worked with, the women at home. hopefully we will reach a place where it is assessed for equality and making sure the work base is to the best. however, there are some things shah rukh khan feels don't need changing, like the film censorship laws in india. you know, there are going to be issues between creative people and what they want to say, but i would say that no filmmaker wants to disturb the sensibilities of the audience. but i don't think any law or rule is outdated, i think of course you'll have to keep on refurbishing them, and people are changing, the society is changing, but culturally, i think we are a very strong nation. and i think that needs to be respected always.

netflix is a big platform for a lot of independent cinema. what do you think about that? it is marvellous. when i was growing up i wanted to be a filmmaker but to be a filmmaker you have to be part of the industry. perhaps now girls and boys are getting the opportunity to get into the theatre and tell the stories. also i think from india's point of view, the fact that our language no longer is a barrier, all languages are appreciated because of the subtitles, i think it is very positive for storytellers. the bollywood superstar has made around 80 films over the last three decades. is it time now to take up more senior roles? my next role will be

as sexy as my last one. so, you want me to be a sexy father, sexy hero, whatever you want me to be. shabnam mahmood, bbc news. earlier, we told you about london's attempt to stop the worst polluting vehicles from being used in the city. but there is an alternative to petrol and diesel fuel. the world's longest electric car trip has just come to an end in sydney, australia. the bbc‘s tim allman has more. when you've been on a long journey, this must be quite a sight — a convoy of electric cars crossing the sydney harbour bridge. leading the way, the blue bandit — a vehicle thatjust keeps going and going and going. i wanted to do my bit to promote this technology and do something which really speaks to the imagination which is driving electric car from amsterdam to literally the other side of the world to show it can be done and why, if i can do it, why can we not use

electric vehicles for daily use? # on the road again # just can't wait to get on the road again.# the scale of this trip was immense. wiebe wakker travelled more than 95,000km — that's twice the circumference of the earth. he visited 33 countries in a journey that lasted more than three years. along the way, he relied on the kindness of strangers who offered him food, shelter, and the occasional use of an electrical socket. quite a journey, quite a car. toots horn but one imagines the trip home is likely to be a lot quicker. tim allman, bbc news. we don't know how he is getting home, do we? get in touch with me on

twitter any time. you're watching bbc news. hello there. the weekend brought us some very mixed fortunes in terms of the weather. for many parts, it was pretty cloudy and drizzly, particularly in the north and east. there were some clear skies though further west. this was the scene as the sun set on sunday night in barnstaple, in devon. as we head through the day on monday then, still some mixed fortunes. a lot of dry and fairly sunny weather developing but there will be some rain around, particularly in the south. we've got a slow—moving weather front which is going to be with us for the next few days. here it is. during the day on monday it'll be draped from south—east england through parts of the midlands, wales up towards northern ireland. so it's ths zone that will stay quite cloudy. first thing in the morning, most of us looking frost—free butjust a touch of frost, i think, for some of the sheltered glens of scotland first thing. through the day, we keep that weak front,

bringing some cloud and showers from south—east england through the midlands, into wales, perhaps one or two showers getting into southern parts of northern ireland. elsewhere a lot of dry and sunny weather. a few showers for the isles of scilly, perhaps towards the channel islands as well. a little bit misty and murky around some of these north sea coasts, but elsewhere, after a murky morning, the mists should clear to leave plenty of sunshine, particularly for the likes of western scotland, northern ireland and north—west england. temperatures between around about 10—17, so still reasonably mild through the day on monday. monday night and into tuesday then, this weather front sticks around in the south so more of that heavy rainforsimilarareas, southern england, south wales as well. again, it's looking like a frost—free night and we are likely to see some mist and fog forming. also some low cloud just pouring in off the north sea. so some of these north—east north sea coasts could well stay quite murky once again. but lots of sunshine developing elsewhere. but we have got that stubborn front bringing more rain along the south coast of england, into south wales too. and you'll notice, by tuesday, that things are starting to turn a little bit cooler so top temperatures around 9 or 10 across the east of scotland.

perhaps 13 or 1a down towards the south—west. but it will turn colder through tuesday night and on into wednesday and that's because we start to import this air from scandinavia. so an easterly breeze developing and a drop in temperature. by the time we get to wednesday, there will more sunshine for most of us. still a little but murky around some of these eastern coasts and just the remnants of that weather front bringing a bit more cloud towards the south—west. but elsewhere, a lot of dry, sunny weather, light winds too, although temperatures not great for this time of year. many of us, particularly towards eastern coasts, are stuck in single figures. and if we look further ahead towards the end of the week, it's looking mostly dry but still rather cool for the time of year, with temperatures generally around 9—13 degrees. that's it for now, bye—bye.