Remember to wash buff regularly @ 60….all those bugs will grow and cause nasty throat/chest infections
You may not be asthmatic, it may be that the cold air is causing your airways to contract. Does asthma run in the family? This can be a decider if you have not shown symptoms in the past. Have you changed anything else in your normal routine like gained a pet, working in a dusty atmosphere, drinking different juices, wines, beer???
Go to asthma.org for more info.
My peak flow right at this moment is 550.
Go buy yourself a peak flow meter from a chemist and keep a daily chart, morn, noon and night. Keep a note of weather and anything irregular that you may do.
imo it`s all the fall-out from diesel engines causing the problem. A trigger for me anyway.