What does this sentence mean? “ The T-charge, or toxicity charge,will apply to older disel and petrol vehicles in what`s been described as the toughest emmission standard of any work-ranking city.” (1) Can I say the T-charge will “be” applied “on” older disel and petrol vehicles? (2) What does“in what`s been described as the toughest emmission standard of any world-ranking city.” mean? Thank you.