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Why do I need health surveillance? I've been using chemicals for years and never had any side effects.
Because prolonged exposure to harmful substances can cause chronic ill health, and symptoms do not always develop immediately.
For example, long-term use of two-pack spray paints containing a fixer called isocyanates can cause chronic asthma. The condition can develop suddenly, when you become 'sensitised' to the chemicals. The fine airborne mist involved in unprotected, uncontrolled spraying with two-pack paints is one of the main causes of occupational asthma in the UK.