Volcanic ash, strenuous exercise and cycling?

Is it safe to engage in strenuous exercise like cycling with Volcanic Ash in our atmosphere? When engaging in strenuous exercise outdoors we are breathing heavily obviously and I was wondering whether the Volcanic Ash could be harmful as if so this could affect cyclists more than others as it's going to be blown in their faces more so than other exercises? If the ash is toxic why haven't the government made people more aware of any dangers that there may be? Even if they aren't sure that there is a risk people should still be informed of a potential risk. Thanks in advance for any replies.
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Having said that, I went out on a hilly 70 mile ride on Sunday and found myself coughing and spluttering in an unfamiliar way. I felt like my breathing wasn't as good as it normally is but it would be hard to prove whether ash had anything to do with it.
It can't be good to inhale dust but it's not good to sit around doing nothing either. I suppose you could try riding wearing a white filter mask and take a good look at it afterwards to see if you could spot any discolouration.
That ash must come down to earth somewhere eventually. I saw somebody in Scotland whose car was covered in the stuff overnight and I thought then that I wouldn't fancy breathing it in...
This is nothing 8)
PTP Runner Up 2015
+1
I haven't even left my house since Thursday last week.
Those who stay indoors will also die
I heard an interview on radio4 with someone who specialised in particulate induced lung disorders and he advised there was very little to worry about. Even when Monseratt (SP?) blew its lid they only recorded a very minor increase in the number of brochitis and asthma related cases they dealt with.
It's supposed to be sunny this weekend volcano or no volcano I'm playing out on my bike!
If your frame is titanium you might be OK though.