44. In the context of WHO Air Quality Guidelines, consider the following statements:
1. The 24-hour mean of PM2.5 should not exceed 15 pg/m3 and the annual mean of PM2.5 should not exceed 5 pg/m3.
2. In a year, the highest levels of ozone pollution occur during periods of inclement weather.
3. PM10 can penetrate the lung and enter the bloodstream.
4. Excessive ozone in the air can trigger asthma.
Which of the statements given above are correct?