With reference to PM 2.5 and PM 10, consider the following statements:
1. PM 2.5 is more harmful than PM 10 because it can penetrate deep into the lungs and even enter the bloodstream.
2. PM 10 mainly affects the upper respiratory system and is largely filtered by the nasal passages.
3. SAFAR (System of Air Quality and Weather Forecasting and Research) exclusively monitors PM 2.5 pollution.
4. PM 2.5 is primarily generated from natural sources like dust storms, while PM 10 comes mainly from combustion-related sources.
Which of the above statements is/are correct?1
1 and 4
2
1 and 2
3
2 and 4
4
All four