Dr Tedros Adhanom Ghebreyesus said it was moving faster than any previous one and had a high risk of spreading to other countries in the region.
READ MOREFear of Ebola is keeping pregnant women away from healthcare facilities in eastern Democratic Republic of Congo, raising the risk of stillbirths, premature births and maternal deaths as the country's deadliest Ebola outbreak continues to disrupt routine medical care.
Responders are warning the deadly haemorrhagic virus is spreading at an unprecedented rate, outpacing efforts to slow it in the remote eastern part of the country.
Pollen levels will be 'very high' in certain areas of England, the Met Office said.
The 'worse than horrific' wait was 6.5 times the NHS England response time guideline.
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