Read the Weather Situation Map of China on March 20th, 2039 and the materials, and answer the following questions. Material: The first snow in 2039 arrived as scheduled.

(n) According to J, the weather in areas A and B of J at this time is sleet;

Observing J, we can see that the wind direction of Peninsula C is northwest at this time, and the wind force is 5.

(3) According to the commonly used weather symbols, the weather in area D is rainstorm at this time, and the color displayed on satellite cloud J is white.

(4) According to J and Q areas, the special weather is sandstorm.

(5)① Air quality is mainly influenced by natural factors and human factors. The air quality in cities should be mainly caused by human factors, because there are relatively many industries in cities and the environment is seriously polluted. Natural factors also account for a small part.

② Automobile exhaust is the main source of air pollution in some big cities in China, so D 。

So the answer is: (n) sleet; ; (he) northwest; Level 5; (3) heavy rain; ? White; (4) sandstorm; (5)①D； ? ②D。