They can cause serious long-term health problems if inhaled for long periods. If you love to weld and can't stop, you should seriously consider using a welding fume extraction to suck out smoke while welding.
Air purifiers can help in the elimination of microbes that result in allergies, asthma, and other respiratory issues. HEPA filters are designed to filter out 99.9% of allergens. Purchasing the best carbon filter on the market can also assist you in removing odours and airborne chemicals.