Lead, ingested or inhaled, is a health hazard. After the addition of lead to petrol has been banned, what still are the sources of lead poisoning? 1. Smelting units 2. Pens and. pencils 3. Paints 4. Hair oils and cosmetics Select the correct answer using the codes given below :

1. The question asks for sources of lead poisoning that persist even after lead was banned from petrol. 2. Statement 1 (Smelting units) is correct. Industrial processes like smelting (especially of lead itself, but also other metals where lead is present) release lead into the environment through fumes and dust, posing an inhalation and ingestion hazard. 3. Statement 2 (Pens and pencils) is incorrect. Modern pencils contain graphite, not lead. While some specialized inks or components might contain trace metals, standard pens and pencils are not considered significant sources of lead poisoning. 4. Statement 3 (Paints) is correct. Lead compounds were widely used in paints (especially older formulations, before bans/restrictions) for color, durability, and faster drying. Dust and chips from deteriorating lead-based paint in older buildings are a major source of lead exposure, particularly for children. 5. Statement 4 (Hair oils and cosmetics) is generally incorrect as a significant widespread source. While some traditional cosmetics (like certain types of kohl/surma) have been found to contain high levels of lead, and contamination is possible, most regulated, modern cosmetics and hair oils are not considered primary sources of lead poisoning compared to smelting or old paint. 6. Therefore, the significant remaining sources listed are smelting units and paints.