Our expert says:
1. for interstitial pneumonitis it may be necessary to take corticosteroids for a prolonged time - one should weigh up the pro's and the con's and if the need for the medication is bigger than possible side effects, you should take it as prescribed.
2. I think a toxocology lab/forensic lab would be the best place to test the particles - ask your GP to find out for you whether you have such a lab in your area. The chemistry department of an university would probably also be able to test this.
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