Objective To understand the health effects and indoor air pollution caused by house decoration in Shizuichan city, Ningxia province. Methods 67 households which were newly decorated were chosen in the different districts of the city. 15days, one month, two months, three months, five months, six months after the decoration finished, formaldehyde, ammonia, benzene, radon in the indoor air were monitored and the questionnaire investigation was conducted. Results After two months, ammonia concentration reached the national standard limit. After 15 days, one month, two months, the rates of exceed limit of formaldehyde were 74.62%, 65.15% and 65.67% respectively, after 3 months ( in June), it was 90.62% and after 6 months, it was 71.21%. After 6 months, benzene concentration decreased slowly. The prevalence rates of throat, eye stimulation, fatigue and so on increased as the pollutants level increased. Conclusion In the investigated city, 6 months after the decoration finished, the indoor air pollution was still serious, which indicates it is not safe to move into those newly decorated rooms, even if after 6 months.

Objective To explore the effect of coronavirus disease 2019 (COVID-19) on the frequency of chest CT scan. Methods A retrospective study was conducted to extract information on the number of outpatient, emergency, and inpatient visits and patients who had chest CT imaging examination from January 1 to December 31, 2020 and in the same period in 2019 through the hospital’s medical data platform for analysis, and the chi-square test was used to analyze whether the difference in the proportion of patients who had chest CT imaging examination between 2019 and 2020 was statistically significant. Results The proportion of outpatients and emergency patients with chest CT examination was significantly higher in 2020 than in 2019 (2.48% vs 1.47%, χ² = 581.7, P < 0.000). The proportion of inpatients who underwent chest CT examination was significantly higher in 2020 than in 2019 (35.47% vs 28.01%, χ² = 182.0, P < 0.000). Conclusion Under the COVID-19 epidemic, the proportion of chest CT examination in this hospital in 2020 shows a significant upward trend compared with the same period in 2019, which will increase the collective dose due to medical exposure, and the hospital should pay attention to the determination of the legitimacy of chest CT scan.