In the context of WHO Air Quality Guidelines, consider the following statements :

1. The 24-hour mean of PM

2.5 should not exceed 15 ng/m3 and annual mean of PM2 5 should not exceed 5 (ig/m

3.

2. In a year, the highest levels of ozone pollution occur during the periods of inclement weather.

3. can penetrate the lung barrier and enter the bloodstream.

4. Excessive ozone in the air can trigger asthma.

Which of the statements given above are correct ?