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23 September 2011 09:30
High pollen levels which cause hay fever may intensify asthma symptoms
Britons with asthma travelling to Pittsburgh may want to arrange some
medical travel insurance first, with studies showing high levels of airborne allergens and mould spores around the US city.
According to researchers at the American Academy of Allergy, Asthma & Immunology the recent spell of hot weather has resulted in strong growth of pollen-producing ragweed in the region.
Combined with rains - which increased humidity and with it the fungal spore concentration in air - the weather has brought difficulties for people with allergies and asthma.
Doctors say the ragweed season has caused a rise in the number of patients coming in with hay fever, which manifests itself in swollen eyes and runny noses. Mould allergies are also more common around this time of the year.
Weather changes at the end of summer are particularly difficult for people who already have inflammatory and respiratory problems, health experts say.
Travellers who have any of the medical conditions should take adequate precautions before jetting off to Pittsburgh.
21 October 2016
A union is warning of travel chaos over the Christmas period at four major UK airports, unless a baggage carrier transfers staff to other companies.
20 October 2016
Thousands of passengers faced travel chaos yesterday after rail service through the Channel Tunnel was suspended because of a power failure.
19 October 2016
People planning holidays from Gatwick Airport in the run up to Christmas could face travel chaos as unions threaten to strike over a pension dispute.
18 October 2016
Eurostar has said it will cut 12 services from London St Pancras to Paris and Brussels.
15 October 2016
Tourists in Thailand are being advised to "behave respectfully" and wear "sombre" clothing as the country mourns King Bhumibol Adulyadej.
14 October 2016
Holidaymakers are being warned to buy currency in advance as exchange rates being offered are as little as 0.96 euro to the pound at airports.
13 October 2016
Scientists say there is strong evidence air pollution and vitamin D deficiency can cause dementia.
12 October 2016
More people are going on holiday than at any time in the past five years despite terror attacks and the impact of Brexit, according to a study.
11 October 2016
People from across North Carolina had to be rescued from their homes as the downgraded Hurricane Matthew blew out to sea - leaving a trail of destruction in its wake.
04 October 2016
People travelling abroad is on the rise, according to the World Tourism Organisation (UNWTO)
08 October 2016
A hurricane pelting the coast of Florida and described as a 'monster' by a local official has brought chaos to the state, with flights cancelled, homes evacuated and theme parks shut.
07 October 2016
Low-cost airline easyJet says its profits will nosedive as terrorist attacks and air traffic control strikes are taking their toll on the company.