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In 2005, the number of days when the city's ambient air quality reached the national first-class (excellent) and second-class (good) standards was 360 days, accounting for 98.6% of the whole year, an increase of 16 days over the previous year; The number of days exceeding Grade II standard is 5 days, accounting for 1.4% of the whole year (see figure 1). The primary pollutant in the air is inhalable particulate matter. The average annual daily concentration of sulfur dioxide is 0.02 1 mg/m3, which is 0.003 mg/m3 lower than that of the previous year. The annual average daily concentration of nitrogen dioxide is 0.039 mg/m3, which is 0.033 mg/m3 lower than the previous year. The average annual daily concentration of inhalable particulate matter is 0.064 mg/m3, which is 0.0 12 mg/m3 lower than the previous year.

The annual average pH value of precipitation in the whole city is 4.59, which is 0. 10 higher than the previous year, and the acidity of precipitation is weakened.

The average annual dust fall is 7.08 tons/km2/month, which meets the recommended standards of Guangdong Province, and is 0.62 tons/km2/month lower than the previous year.

In 2004, the city's ambient air quality was generally at a good level, and the number of days to reach the national first-class (excellent) and second-class (good) ambient air quality standards was 344 days, accounting for 94.0% of the whole year, but it was 5 days less than the previous year. The main pollutants in the air are nitrogen dioxide and inhalable particles, and their pollution loads account for 43.7% and 36.9% respectively. The annual average daily concentration of sulfur dioxide is 0.024 mg/m3, an increase of 0.004 mg/m3 over the previous year. The annual average daily concentration of nitrogen dioxide is 0.072 mg/m3, which is 0.0 1.5 mg/m3 higher than that of the previous year. The average annual daily concentration of inhalable particulate matter was 0.076 mg/m3, an increase of 0.006 mg/m3 over the previous year.

The annual average pH value of precipitation is 4.49, which is 0.44 lower than the previous year, and the acidity of precipitation is enhanced. The frequency of acid rain was 78.9%, an increase of 26. 1 percentage point over the previous year.

The annual average dust concentration is 7.70 tons/km2 month, which meets the recommended standard of Guangdong Province (8 tons/km2 month) and is 0.22 tons/km2 month higher than the previous year.

In 2003, the proportion of days when the city's ambient air quality reached the national first-class (excellent air quality) and second-class (good air quality) standards was 95.6%, including 40.5% of the first-class standards and 55. 1% of the second-class standards. The number of days exceeding the secondary standard accounted for 4.4%. The main pollutants in the air are inhalable particles and nitrogen dioxide.

(1) Ambient air quality

The average annual daily concentration of sulfur dioxide in the air is 0.020 mg/m3, an increase of 0.002 mg/m3 over the previous year. The annual average daily concentration of nitrogen dioxide was 0.057 mg/m3, an increase of 0.007 mg/m3 over the previous year. The average daily concentration of inhalable particulate matter in the city is 0.070 mg/m3, which is 0.009 mg/m3 higher than the previous year.

The annual average precipitation pH value in the city is 4.93, which is 0.3 1 higher than the previous year, and the frequency of acid rain is 52.8%. Compared with 2002, the acidity of precipitation weakened and the frequency of acid rain increased by 14.3 percentage points.

In 2003, the average annual dust concentration in the whole city was 7.48 tons/km2 month, which reached the recommended standard of Guangdong Province and was 1.70 tons/km2 month higher than that in 2002. The maximum value is 3 1.0 ton/km2 month, which is 2.9 times higher than the standard. The over-standard rate of measured values in each month in the city is 34.6%, and the amount of dust falling in June, March, June, June and February is relatively high.

In 2002, the proportion of days when the city's ambient air quality reached Grade I (excellent air quality) and Grade II (good air quality) was 99.4%, including 49.3% for Grade I and 50. 1% for Grade II. The main pollutants in the air are nitrogen dioxide and inhalable particles.

(1) Ambient air quality

The average annual daily concentration of sulfur dioxide in the air is 0.0 18mg/m3, which is 0.009mg/m3 lower than that of the previous year. The annual average daily concentration of nitrogen dioxide is 0.050 mg/m3, which is 0.008 mg/m3 lower than the previous year. The average annual daily concentration of inhalable particulate matter in the city is 0.06 1 mg/m3, which is 0.002 mg/m3 lower than the previous year.

The annual average precipitation pH value of the whole city is 4.62, which is 0.32 lower than the previous year, and the frequency of acid rain is 38.5%. Compared with 200 1, the acidity of precipitation increased and the frequency of acid rain decreased by 3.5 percentage points.

The average monthly dustfall of the whole city is 5.78 tons/km2 month, which is 0.44 tons/km2 month higher than the previous year and lower than the recommended standard of Guangdong Province (8 tons/km2 month). Among them, Yantian District and Nanshan District have relatively high dustfall in June 5438+ 10 and June 5438+065438+ 10.

In 200 1 year, the days when the ambient air quality of the whole city reached the national first-class (excellent air quality) and second-class (good air quality) standards accounted for more than 99% of the whole year, of which 38% reached the first-class standard and 6 1% reached the second-class standard. The main pollutants in the air are nitrogen dioxide and inhalable particles.

1, ambient air quality

The average annual concentration of sulfur dioxide in the air is 0.027 mg/m3, which is the same as that in 2000. The average annual concentration of nitrogen dioxide is 0.058 mg/m3, which is 5.45% higher than that in 2000. The average annual concentration of inhalable particulate matter in the city is 0.063 mg/m3, which is 6.78% higher than that in 2000. The annual average pH value of precipitation in the city is 4.94, and the frequency of acid rain is 42%. Compared with 2000, the acidity of precipitation was basically the same, and the frequency of acid rain increased by 65438 0.8 percentage points. The average annual dustfall in the city is 5.35 tons/km2/month, which is 65,438 0.7% higher than that in 2000 and lower than the recommended standard of Guangdong Province (8 tons/km2/month).

According to the monitoring results of air quality in Shenzhen, in 2000, 99% of the days when the city's air quality reached the first-class standard (excellent air quality) and the second-class standard (good air quality), of which 47.6% reached the first-class standard and 5 1.4% reached the second-class standard, indicating that the city's ambient air quality is still good as a whole. The annual average daily concentration of sulfur dioxide in the city is 27 μ g/m3, an increase of 14 μ g/m3 over the previous year. The average annual daily concentration of nitrogen dioxide is 55 μ g/m3, an increase of 7 μ g/m3 over the previous year. The average annual daily concentration of total suspended particulate matter in the atmosphere is 9 1 μ g/m3, an increase of 4 μ g/m3 over the previous year. The annual average pH value of precipitation in the whole city is 4.95, which is 0. 1 pH unit lower than the previous year. The frequency of acid rain was 40.2%, an increase of 1 1.9 percentage points over the previous year. Acid rain accounted for 44.5% of the total rainfall, up 6.9 percentage points over the previous year.