及(ji)(ji)密云县(xian)西(xi)(xi)北(bei)(bei)部至怀柔(rou)东(dong)(dong)(dong)部一(yi)带，年(nian)(nian)辐射量(liang)均(jun)在(zai)(zai) 135千(qian)(qian)卡/厘米(mi)以上(shang)(shang)；低值(zhi)区(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)位(wei)于房(fang)山(shan)区(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)的(de)霞云岭附近，年(nian)(nian)辐射量(liang)为112千(qian)(qian)卡/厘米(mi)。北(bei)(bei)京年(nian)(nian)平(ping)均(jun)日(ri)(ri)(ri)照(zhao)(zhao)时(shi)(shi)数(shu)(shu)在(zai)(zai)2000-2800小(xiao)时(shi)(shi)之间(jian)。大部分地(di)区(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)在(zai)(zai)2600小(xiao)时(shi)(shi)左右。年(nian)(nian)日(ri)(ri)(ri)照(zhao)(zhao)分布(bu)与太阳(yang)(yang)辐射的(de)分布(bu)相一(yi)致，最大值(zhi)在(zai)(zai)延庆县(xian)和(he)古北(bei)(bei)口，为2800小(xiao)时(shi)(shi)以上(shang)(shang)，最小(xiao)值(zhi)分布(bu)在(zai)(zai)霞云岭，日(ri)(ri)(ri)照(zhao)(zhao)为2063小(xiao)时(shi)(shi)。全年(nian)(nian)日(ri)(ri)(ri)照(zhao)(zhao)时(shi)(shi)数(shu)(shu)以春季(ji)最多(duo)，月(yue)(yue)日(ri)(ri)(ri)照(zhao)(zhao)在(zai)(zai)230-290小(xiao)时(shi)(shi)；夏(xia)季(ji)正当雨季(ji)，日(ri)(ri)(ri)照(zhao)(zhao)时(shi)(shi)数(shu)(shu)减少，月(yue)(yue)日(ri)(ri)(ri)照(zhao)(zhao)在(zai)(zai)230小(xiao)时(shi)(shi)左右；秋季(ji)日(ri)(ri)(ri)照(zhao)(zhao)时(shi)(shi)数(shu)(shu)虽没有春季(ji)多(duo)，但比(bi)夏(xia)季(ji)要多(duo)，月(yue)(yue)日(ri)(ri)(ri)照(zhao)(zhao)230-245小(xiao)时(shi)(shi)；冬季(ji)是(shi)一(yi)年(nian)(nian)中日(ri)(ri)(ri)照(zhao)(zhao)时(shi)(shi)数(shu)(shu)最少季(ji)节，月(yue)(yue)日(ri)(ri)(ri)照(zhao)(zhao)不足200小(xiao)时(shi)(shi)，一(yi)般在(zai)(zai)170-190小(xiao)时(shi)(shi)。环(huan)(huan)(huan)境(jing)保护与绿(lv)化(hua)(hua)(hua)　　曾经(jing)的(de)北(bei)(bei)京及(ji)(ji)华(hua)北(bei)(bei)春季(ji)多(duo)发沙(sha)尘暴，经(jing)过多(duo)年(nian)(nian)治理(li)(li)，取得显著(zhu)成(cheng)效。2009年(nian)(nian)北(bei)(bei)京全年(nian)(nian)空(kong)气质量(liang)达(da)到(dao)二级和(he)好(hao)于二级的(de)天数(shu)(shu)为285天，比(bi)上(shang)(shang)年(nian)(nian)增加11天，占全年(nian)(nian)总天数(shu)(shu)的(de)78.1%。 　　水(shui)环(huan)(huan)(huan)境(jing)治理(li)(li)力度加大。2009年(nian)(nian)北(bei)(bei)京污(wu)水(shui)日(ri)(ri)(ri)处(chu)(chu)理(li)(li)能(neng)力达(da)到(dao)356万(wan)立(li)方米(mi)，污(wu)水(shui)处(chu)(chu)理(li)(li)率(lv)达(da)到(dao)80%。再生(sheng)水(shui)利用取得新进(jin)展(zhan)，2009年(nian)(nian)再生(sheng)水(shui)利用量(liang)达(da)到(dao)6.5亿立(li)方米(mi)。 　　继续积极推(tui)动其(qi)他环(huan)(huan)(huan)境(jing)污(wu)染(ran)防治工(gong)(gong)作(zuo)。2009年(nian)(nian)北(bei)(bei)京生(sheng)活(huo)垃圾无害化(hua)(hua)(hua)处(chu)(chu)理(li)(li)率(lv)达(da)到(dao)95.8%。 　　城(cheng)(cheng)(cheng)(cheng)市(shi)(shi)园林(lin)绿(lv)化(hua)(hua)(hua)步(bu)伐加快(kuai)。2009年(nian)(nian)末，北(bei)(bei)京城(cheng)(cheng)(cheng)(cheng)镇人均(jun)公园绿(lv)地(di)面(mian)积14.5平(ping)方米(mi)。城(cheng)(cheng)(cheng)(cheng)镇绿(lv)化(hua)(hua)(hua)覆盖率(lv)达(da)到(dao)44.4%。全市(shi)(shi)林(lin)木(mu)绿(lv)化(hua)(hua)(hua)率(lv)达(da)到(dao)52.6%。行(xing)(xing)政(zheng)区(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)划(hua)(hua)　　北(bei)(bei)京城(cheng)(cheng)(cheng)(cheng)区(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)地(di)图解放后(hou)北(bei)(bei)京的(de)行(xing)(xing)政(zheng)区(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)划(hua)(hua)范围经(jing)过五(wu)次调整，直到(dao)2010年(nian)(nian)形(xing)成(cheng)了今天14区(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)、2县(xian)的(de)格局。截(jie)至2010年(nian)(nian)，北(bei)(bei)京共有140个(ge)(ge)(ge)(ge)街道办事处(chu)(chu)、142个(ge)(ge)(ge)(ge)建制镇、35个(ge)(ge)(ge)(ge)建制乡(xiang)、2554个(ge)(ge)(ge)(ge)社区(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)居委会和(he)3955个(ge)(ge)(ge)(ge)村民委员会。其(qi)中地(di)处(chu)(chu)北(bei)(bei)京二环(huan)(huan)(huan)路以内的(de)东(dong)(dong)(dong)城(cheng)(cheng)(cheng)(cheng)区(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)、西(xi)(xi)城(cheng)(cheng)(cheng)(cheng)区(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)两个(ge)(ge)(ge)(ge)区(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)是(shi)传统(tong)上(shang)(shang)的(de)内城(cheng)(cheng)(cheng)(cheng)区(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)，而随(sui)着(zhe)城(cheng)(cheng)(cheng)(cheng)市(shi)(shi)的(de)扩张，朝阳(yang)(yang)区(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)、海淀区(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)、丰(feng)台区(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)和(he)石(shi)景山(shan)区(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)也被认为是(shi)城(cheng)(cheng)(cheng)(cheng)内地(di)区(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)，形(xing)成(cheng)了“城(cheng)(cheng)(cheng)(cheng)六区(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)”的(de)概念。规划(hua)(hua)中北(bei)(bei)京市(shi)(shi)城(cheng)(cheng)(cheng)(cheng)区(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)的(de)范围是(shi)北(bei)(bei)京五(wu)环(huan)(huan)(huan)路以内。近年(nian)(nian)来(lai)随(sui)着(zhe)城(cheng)(cheng)(cheng)(cheng)市(shi)(shi)化(hua)(hua)(hua)进(jin)程的(de)加快(kuai)，先后(hou)有数(shu)(shu)个(ge)(ge)(ge)(ge)近郊县(xian)改为区(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)。由于北(bei)(bei)京市(shi)(shi)政(zheng)治、文化(hua)(hua)(hua)中心(xin)的(de)定位(wei)，工(gong)(gong)业重心(xin)正在(zai)(zai)逐渐外移。 　　2010年(nian)(nian)7月(yue)(yue)1日(ri)(ri)(ri)，中国国务院正式(shi)批复了北(bei)(bei)京市(shi)(shi)政(zheng)府关于调整首(shou)都(dou)功(gong)能(neng)核(he)心(xin)区(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)行(xing)(xing)政(zheng)区(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)划(hua)(hua)的(de)请示(shi)，同意(yi)[10]撤销北(bei)(bei)京市(shi)(shi)原(yuan)(yuan)东(dong)(dong)(dong)城(cheng)(cheng)(cheng)(cheng)区(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)、崇文区(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)，设立(li)新的(de)北(bei)(bei)京市(shi)(shi)东(dong)(dong)(dong)城(cheng)(cheng)(cheng)(cheng)区(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)，撤销北(bei)(bei)京市(shi)(shi)原(yuan)(yuan)西(xi)(xi)城(cheng)(cheng)(cheng)(cheng)区(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)、宣武(wu)区(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)，设立(li)新的(de)北(bei)(bei)京市(shi)(shi)西(xi)(xi)城(cheng)(cheng)(cheng)(cheng)区(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)。 　　以下为北(bei)(bei)京市(shi)(shi)各分区(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)情况（2010调整后(hou)）： 　　①首(shou)都(dou)功(gong)能(neng)核(he)心(xin)区(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)　 　　首(shou)都(dou)功(gong)能(neng)核(he)心(xin)区(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)(qu)面(mian)积（平(ping)方公里）