AQSQID: 510870014

Site Name: Math & Science Ctr

Location: Henrico Co, VA

Reporting: True, Located: True

Current AQI: 48.0

Henrico Co VA, US: 37.5583, -77.400299

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
May 24, 2019, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) 39.0 ppb (30) 0.2 ppb (2) N/A 11.5 μg/m3 (48) 48.0
 
May 23, 2019, 11 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 39.0 ppb (30) 0.2 ppb (2) N/A 11.1 μg/m3 (46) 46.0
 
May 23, 2019, 10 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 40.0 ppb (31) 0.2 ppb (2) N/A 10.9 μg/m3 (45) 45.0
 
May 23, 2019, 9 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 43.0 ppb (33) 0.2 ppb (2) N/A 10.5 μg/m3 (44) 44.0
 
May 23, 2019, 8 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 45.0 ppb (35) 0.2 ppb (2) N/A 9.2 μg/m3 (38) 38.0
 
May 23, 2019, 7 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 45.0 ppb (35) 0.2 ppb (2) N/A 8.3 μg/m3 (35) 35.0
 
May 23, 2019, 6 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 44.0 ppb (34) 0.2 ppb (2) N/A 7.8 μg/m3 (32) 34.0
 
May 23, 2019, 5 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 45.0 ppb (35) 0.2 ppb (2) N/A 7.9 μg/m3 (33) 35.0
 
May 23, 2019, 4 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 44.0 ppb (34) 0.2 ppb (2) N/A 8.5 μg/m3 (35) 35.0
 
May 23, 2019, 3 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 45.0 ppb (35) 0.2 ppb (2) N/A 8.5 μg/m3 (35) 35.0
 
May 23, 2019, 2 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 43.0 ppb (33) 0.2 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
May 23, 2019, 1 p.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 38.0 ppb (29) 0.2 ppb (2) N/A 6.8 μg/m3 (28) 29.0
 
May 23, 2019, noon N/A N/A N/A N/A N/A 1.0 ppb (1) 27.0 ppb (21) 0.2 ppb (2) N/A 5.8 μg/m3 (24) 24.0
 
May 23, 2019, 11 a.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 28.0 ppb (22) 0.2 ppb (2) N/A 5.3 μg/m3 (22) 22.0
 
May 23, 2019, 10 a.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 29.0 ppb (22) 0.2 ppb (2) N/A 4.6 μg/m3 (19) 22.0
 
May 23, 2019, 9 a.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 30.0 ppb (23) 0.1 ppb (1) N/A 4.3 μg/m3 (18) 23.0
 
May 23, 2019, 8 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 28.0 ppb (22) 0.1 ppb (1) N/A 4.4 μg/m3 (18) 22.0
 
May 23, 2019, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 32.0 ppb (25) 0.1 ppb (1) N/A 4.5 μg/m3 (19) 25.0
 
May 23, 2019, 6 a.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 33.0 ppb (25) 0.1 ppb (1) N/A 4.7 μg/m3 (20) 25.0
 
May 23, 2019, 5 a.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 31.0 ppb (24) 0.1 ppb (1) N/A 4.3 μg/m3 (18) 24.0
 
May 23, 2019, 4 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 35.0 ppb (27) 0.1 ppb (1) N/A 4.2 μg/m3 (18) 27.0
 
May 23, 2019, 3 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 36.0 ppb (28) 0.1 ppb (1) N/A 4.1 μg/m3 (17) 28.0
 
May 23, 2019, 2 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 38.0 ppb (29) 0.1 ppb (1) N/A 4.4 μg/m3 (18) 29.0
 
May 23, 2019, 1 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 42.0 ppb (32) 0.2 ppb (2) N/A 4.5 μg/m3 (19) 32.0
 
May 23, 2019, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) 45.0 ppb (35) 0.1 ppb (1) N/A 4.6 μg/m3 (19) 35.0
 
May 22, 2019, 11 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 44.0 ppb (34) 0.2 ppb (2) N/A 5.1 μg/m3 (21) 34.0
 
May 22, 2019, 10 p.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 54.0 ppb (42) 0.2 ppb (2) N/A 4.8 μg/m3 (20) 42.0
 
May 22, 2019, 9 p.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 52.0 ppb (40) 0.1 ppb (1) N/A 4.6 μg/m3 (19) 40.0
 
May 22, 2019, 8 p.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 47.0 ppb (36) 0.1 ppb (1) N/A 4.6 μg/m3 (19) 36.0
 
May 22, 2019, 7 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 51.0 ppb (39) 0.1 ppb (1) N/A 4.4 μg/m3 (18) 39.0
 
May 22, 2019, 6 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 53.0 ppb (41) 0.1 ppb (1) N/A 4.0 μg/m3 (17) 41.0
 
May 22, 2019, 5 p.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 46.0 ppb (35) 0.1 ppb (1) N/A 3.6 μg/m3 (15) 35.0
 
May 22, 2019, 4 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 43.0 ppb (33) 0.1 ppb (1) N/A 3.4 μg/m3 (14) 33.0
 
May 22, 2019, 3 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 41.0 ppb (32) 0.1 ppb (1) N/A 3.4 μg/m3 (14) 32.0
 
May 22, 2019, 2 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 38.0 ppb (29) 0.1 ppb (1) N/A 3.4 μg/m3 (14) 29.0
 
May 22, 2019, 1 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 35.0 ppb (27) 0.1 ppb (1) N/A 4.0 μg/m3 (17) 27.0
 
May 22, 2019, noon N/A N/A N/A N/A N/A 0.0 ppb (0) 27.0 ppb (21) 0.2 ppb (2) N/A 4.6 μg/m3 (19) 21.0
 
May 22, 2019, 11 a.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 18.0 ppb (14) 0.2 ppb (2) N/A 4.8 μg/m3 (20) 20.0
 
May 22, 2019, 10 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 8.0 ppb (6) 0.2 ppb (2) N/A 4.8 μg/m3 (20) 20.0
 
May 22, 2019, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 5.0 ppb (4) 0.2 ppb (2) N/A 4.7 μg/m3 (20) 20.0
 
May 22, 2019, 8 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 8.0 ppb (6) 0.2 ppb (2) N/A 4.6 μg/m3 (19) 19.0
 
May 22, 2019, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 12.0 ppb (9) 0.2 ppb (2) N/A 4.4 μg/m3 (18) 18.0
 
May 22, 2019, 6 a.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 17.0 ppb (13) 0.2 ppb (2) N/A 4.1 μg/m3 (17) 17.0
 
May 22, 2019, 5 a.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 20.0 ppb (15) 0.2 ppb (2) N/A 3.9 μg/m3 (16) 16.0
 
May 22, 2019, 4 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 26.0 ppb (20) 0.2 ppb (2) N/A 3.6 μg/m3 (15) 20.0
 
May 22, 2019, 3 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 31.0 ppb (24) 0.2 ppb (2) N/A 3.6 μg/m3 (15) 24.0
 
May 22, 2019, 2 a.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 36.0 ppb (28) 0.2 ppb (2) N/A 3.8 μg/m3 (16) 28.0
 
May 22, 2019, 1 a.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 41.0 ppb (32) 0.2 ppb (2) N/A 4.1 μg/m3 (17) 32.0
 
May 22, 2019, midnight N/A N/A N/A N/A N/A 1.0 ppb (1) 45.0 ppb (35) 0.2 ppb (2) N/A 4.7 μg/m3 (20) 35.0
 
May 21, 2019, 11 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 51.0 ppb (39) 0.1 ppb (1) N/A 4.6 μg/m3 (19) 39.0
 
May 21, 2019, 10 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 52.0 ppb (40) 0.1 ppb (1) N/A 5.1 μg/m3 (21) 40.0
 
May 21, 2019, 9 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 48.0 ppb (37) 0.1 ppb (1) N/A 5.7 μg/m3 (24) 37.0
 
May 21, 2019, 8 p.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 45.0 ppb (35) 0.2 ppb (2) N/A 6.1 μg/m3 (25) 35.0
 
May 21, 2019, 7 p.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 46.0 ppb (35) 0.2 ppb (2) N/A 6.3 μg/m3 (26) 35.0
 
May 21, 2019, 6 p.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 45.0 ppb (35) 0.2 ppb (2) N/A 6.2 μg/m3 (26) 35.0
 
May 21, 2019, 5 p.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 42.0 ppb (32) 0.2 ppb (2) N/A 6.1 μg/m3 (25) 32.0
 
May 21, 2019, 4 p.m. N/A N/A N/A N/A N/A 1.0 ppb (1) N/A 0.2 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
May 21, 2019, 3 p.m. N/A N/A N/A N/A N/A 1.0 ppb (1) N/A 0.2 ppb (2) N/A 5.2 μg/m3 (22) 22.0
 
May 21, 2019, 2 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.2 ppb (2) N/A 4.7 μg/m3 (20) 20.0
 
May 21, 2019, 1 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.1 ppb (1) N/A 4.6 μg/m3 (19) 19.0
 
May 21, 2019, noon N/A N/A N/A N/A N/A N/A N/A N/A N/A 5.7 μg/m3 (24) 24.0
 
May 21, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 6.5 μg/m3 (27) 27.0
 
May 21, 2019, 10 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 25.0 ppb (19) 0.1 ppb (1) N/A 6.8 μg/m3 (28) 28.0
 
May 21, 2019, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.1 ppb (1) N/A 9.3 μg/m3 (39) 39.0
 
May 21, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 25.0 ppb (19) N/A N/A 10.6 μg/m3 (44) 44.0
 
May 21, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 20.0 ppb (15) N/A N/A 11.5 μg/m3 (48) 48.0
 
May 21, 2019, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 21.0 ppb (16) 0.2 ppb (2) N/A 12.1 μg/m3 (50) 50.0
 
May 21, 2019, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 24.0 ppb (18) 0.2 ppb (2) N/A 12.0 μg/m3 (50) 50.0
 
May 21, 2019, 4 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 28.0 ppb (22) 0.2 ppb (2) N/A 12.2 μg/m3 (50) 50.0
 
May 21, 2019, 3 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 32.0 ppb (25) 0.2 ppb (2) N/A 11.6 μg/m3 (48) 48.0
 
May 21, 2019, 2 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 31.0 ppb (24) 0.2 ppb (2) N/A 10.8 μg/m3 (45) 45.0
 
May 21, 2019, 1 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 30.0 ppb (23) 0.2 ppb (2) N/A 10.2 μg/m3 (42) 42.0
 
May 21, 2019, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) 33.0 ppb (25) 0.2 ppb (2) N/A 8.6 μg/m3 (36) 36.0
 
May 20, 2019, 11 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 42.0 ppb (32) 0.2 ppb (2) N/A 9.6 μg/m3 (40) 40.0
 
May 20, 2019, 10 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 43.0 ppb (33) 0.2 ppb (2) N/A 11.4 μg/m3 (48) 48.0
 
May 20, 2019, 9 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 43.0 ppb (33) 0.2 ppb (2) N/A 13.7 μg/m3 (54) 54.0
 
May 20, 2019, 8 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 47.0 ppb (36) 0.2 ppb (2) N/A 14.3 μg/m3 (55) 55.0
 
May 20, 2019, 7 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 46.0 ppb (35) 0.2 ppb (2) N/A 14.2 μg/m3 (55) 55.0
 
May 20, 2019, 6 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 43.0 ppb (33) 0.2 ppb (2) N/A 13.5 μg/m3 (53) 53.0
 
May 20, 2019, 5 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 42.0 ppb (32) 0.2 ppb (2) N/A 12.7 μg/m3 (51) 51.0
 
May 20, 2019, 4 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 39.0 ppb (30) 0.2 ppb (2) N/A 11.8 μg/m3 (49) 49.0
 
May 20, 2019, 3 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 36.0 ppb (28) 0.2 ppb (2) N/A 10.9 μg/m3 (45) 45.0
 
May 20, 2019, 2 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 32.0 ppb (25) 0.2 ppb (2) N/A 9.5 μg/m3 (40) 40.0
 
May 20, 2019, 1 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 28.0 ppb (22) 0.2 ppb (2) N/A 9.5 μg/m3 (40) 40.0
 
May 20, 2019, noon N/A N/A N/A N/A N/A 0.0 ppb (0) 24.0 ppb (18) 0.2 ppb (2) N/A 9.6 μg/m3 (40) 40.0
 
May 20, 2019, 11 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 21.0 ppb (16) 0.2 ppb (2) N/A 9.5 μg/m3 (40) 40.0
 
May 20, 2019, 10 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 23.0 ppb (18) 0.2 ppb (2) N/A 9.5 μg/m3 (40) 40.0
 
May 20, 2019, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 28.0 ppb (22) 0.1 ppb (1) N/A 10.2 μg/m3 (42) 42.0
 
May 20, 2019, 8 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 31.0 ppb (24) 0.1 ppb (1) N/A 11.5 μg/m3 (48) 48.0
 
May 20, 2019, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 34.0 ppb (26) 0.1 ppb (1) N/A 11.6 μg/m3 (48) 48.0
 
May 20, 2019, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 37.0 ppb (28) 0.1 ppb (1) N/A 11.9 μg/m3 (50) 50.0
 
May 20, 2019, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 39.0 ppb (30) 0.2 ppb (2) N/A 13.0 μg/m3 (52) 52.0
 
May 20, 2019, 4 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 41.0 ppb (32) 0.2 ppb (2) N/A 14.8 μg/m3 (56) 56.0
 
May 20, 2019, 3 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 40.0 ppb (31) 0.2 ppb (2) N/A 15.3 μg/m3 (57) 57.0
 
May 20, 2019, 2 a.m. N/A N/A N/A N/A N/A 2.0 ppb (3) 40.0 ppb (31) 0.2 ppb (2) N/A 16.1 μg/m3 (59) 59.0
 
May 20, 2019, 1 a.m. N/A N/A N/A N/A N/A 2.0 ppb (3) 34.0 ppb (26) 0.2 ppb (2) N/A 15.1 μg/m3 (57) 57.0
 
May 20, 2019, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) 42.0 ppb (32) 0.2 ppb (2) N/A 14.6 μg/m3 (56) 56.0
 
May 19, 2019, 11 p.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 44.0 ppb (34) 0.3 ppb (3) N/A 14.5 μg/m3 (55) 55.0
 
May 19, 2019, 10 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 49.0 ppb (38) 0.2 ppb (2) N/A 15.7 μg/m3 (58) 58.0
 
May 19, 2019, 9 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 52.0 ppb (40) 0.2 ppb (2) N/A 15.8 μg/m3 (58) 58.0
 
May 19, 2019, 8 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 51.0 ppb (39) 0.2 ppb (2) N/A 14.9 μg/m3 (56) 56.0
 
May 19, 2019, 7 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 52.0 ppb (40) 0.2 ppb (2) N/A 16.3 μg/m3 (59) 59.0
 
May 19, 2019, 6 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 51.0 ppb (39) 0.2 ppb (2) N/A 16.7 μg/m3 (60) 60.0
 
May 19, 2019, 5 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 47.0 ppb (36) 0.2 ppb (2) N/A 16.8 μg/m3 (60) 60.0
 
May 19, 2019, 4 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 46.0 ppb (35) 0.2 ppb (2) N/A 17.1 μg/m3 (61) 61.0
 
May 19, 2019, 3 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 43.0 ppb (33) 0.2 ppb (2) N/A 16.5 μg/m3 (60) 60.0
 
May 19, 2019, 2 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 40.0 ppb (31) 0.2 ppb (2) N/A 16.3 μg/m3 (59) 59.0
 
May 19, 2019, 1 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 35.0 ppb (27) 0.2 ppb (2) N/A 15.1 μg/m3 (57) 57.0
 
May 19, 2019, noon N/A N/A N/A N/A N/A 1.0 ppb (1) 24.0 ppb (18) 0.2 ppb (2) N/A 14.1 μg/m3 (54) 54.0
 
May 19, 2019, 11 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 27.0 ppb (21) 0.2 ppb (2) N/A 12.8 μg/m3 (52) 52.0
 
May 19, 2019, 10 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 25.0 ppb (19) 0.2 ppb (2) N/A 12.3 μg/m3 (51) 51.0
 
May 19, 2019, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 31.0 ppb (24) 0.2 ppb (2) N/A 12.6 μg/m3 (51) 51.0
 
May 19, 2019, 8 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 32.0 ppb (25) 0.2 ppb (2) N/A 13.2 μg/m3 (53) 53.0
 
May 19, 2019, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 29.0 ppb (22) 0.2 ppb (2) N/A 12.7 μg/m3 (51) 51.0
 
May 19, 2019, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 31.0 ppb (24) 0.2 ppb (2) N/A 13.3 μg/m3 (53) 53.0
 
May 19, 2019, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 35.0 ppb (27) 0.2 ppb (2) N/A 13.3 μg/m3 (53) 53.0
 
May 19, 2019, 4 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 37.0 ppb (28) 0.2 ppb (2) N/A 12.9 μg/m3 (52) 52.0
 
May 19, 2019, 3 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 41.0 ppb (32) 0.2 ppb (2) N/A 12.5 μg/m3 (51) 51.0
 
May 19, 2019, 2 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 46.0 ppb (35) 0.2 ppb (2) N/A 12.6 μg/m3 (51) 51.0
 
May 19, 2019, 1 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 45.0 ppb (35) 0.2 ppb (2) N/A 10.5 μg/m3 (44) 44.0
 
May 19, 2019, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) 49.0 ppb (38) 0.2 ppb (2) N/A 9.9 μg/m3 (41) 41.0
 
May 18, 2019, 11 p.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 57.0 ppb (44) 0.2 ppb (2) N/A 10.1 μg/m3 (42) 44.0
 
May 18, 2019, 10 p.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 72.0 ppb (56) 0.2 ppb (2) N/A 10.1 μg/m3 (42) 56.0
 
May 18, 2019, 9 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 70.0 ppb (54) 0.2 ppb (2) N/A 10.5 μg/m3 (44) 54.0
 
May 18, 2019, 8 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 69.0 ppb (53) 0.2 ppb (2) N/A 9.4 μg/m3 (39) 53.0
 
May 18, 2019, 7 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 67.0 ppb (52) 0.2 ppb (2) N/A 8.6 μg/m3 (36) 52.0
 
May 18, 2019, 6 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 65.0 ppb (50) 0.2 ppb (2) N/A 8.5 μg/m3 (35) 50.0
 
May 18, 2019, 5 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 61.0 ppb (47) 0.2 ppb (2) N/A 7.7 μg/m3 (32) 47.0
 
May 18, 2019, 4 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 56.0 ppb (43) 0.2 ppb (2) N/A 7.4 μg/m3 (31) 43.0
 
May 18, 2019, 3 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 50.0 ppb (38) 0.2 ppb (2) N/A 6.7 μg/m3 (28) 38.0
 
May 18, 2019, 2 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 40.0 ppb (31) 0.2 ppb (2) N/A 6.6 μg/m3 (28) 31.0
 
May 18, 2019, 1 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 24.0 ppb (18) 0.3 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
May 18, 2019, noon N/A N/A N/A N/A N/A 0.0 ppb (0) 9.0 ppb (7) 0.4 ppb (4) N/A 7.6 μg/m3 (32) 32.0
 
May 18, 2019, 11 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 4.0 ppb (3) 0.3 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
May 18, 2019, 10 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 9.0 ppb (7) 0.2 ppb (2) N/A 6.3 μg/m3 (26) 26.0
 
May 18, 2019, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.2 ppb (2) N/A 7.5 μg/m3 (31) 31.0
 
May 18, 2019, 8 a.m. N/A N/A N/A N/A N/A N/A 11.0 ppb (8) N/A N/A 7.6 μg/m3 (32) 32.0
 
May 18, 2019, 7 a.m. N/A N/A N/A N/A N/A N/A 12.0 ppb (9) N/A N/A 7.6 μg/m3 (32) 32.0
 
May 18, 2019, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 16.0 ppb (12) 0.3 ppb (3) N/A 7.4 μg/m3 (31) 31.0
 
May 18, 2019, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 18.0 ppb (14) 0.3 ppb (3) N/A 6.7 μg/m3 (28) 28.0
 
May 18, 2019, 4 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 25.0 ppb (19) 0.2 ppb (2) N/A 6.4 μg/m3 (27) 27.0
 
May 18, 2019, 3 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 33.0 ppb (25) 0.2 ppb (2) N/A 8.3 μg/m3 (35) 35.0
 
May 18, 2019, 2 a.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 29.0 ppb (22) 0.3 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
May 18, 2019, 1 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 23.0 ppb (18) 0.4 ppb (4) N/A 6.1 μg/m3 (25) 25.0
 
May 18, 2019, midnight N/A N/A N/A N/A N/A 0.0 ppb (0) 32.0 ppb (25) 0.3 ppb (3) N/A 5.4 μg/m3 (23) 25.0
 
May 17, 2019, 11 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 46.0 ppb (35) 0.2 ppb (2) N/A 5.6 μg/m3 (23) 35.0
 
May 17, 2019, 10 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 51.0 ppb (39) 0.2 ppb (2) N/A 5.7 μg/m3 (24) 39.0
 
May 17, 2019, 9 p.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 52.0 ppb (40) 0.2 ppb (2) N/A 6.0 μg/m3 (25) 40.0
 
May 17, 2019, 8 p.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 51.0 ppb (39) 0.2 ppb (2) N/A 7.1 μg/m3 (30) 39.0
 
May 17, 2019, 7 p.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 52.0 ppb (40) 0.2 ppb (2) N/A 9.9 μg/m3 (41) 41.0
 
May 17, 2019, 6 p.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 51.0 ppb (39) 0.2 ppb (2) N/A 11.5 μg/m3 (48) 48.0
 
May 17, 2019, 5 p.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 48.0 ppb (37) 0.2 ppb (2) N/A 11.6 μg/m3 (48) 48.0
 
May 17, 2019, 4 p.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 46.0 ppb (35) 0.2 ppb (2) N/A 11.6 μg/m3 (48) 48.0
 
May 17, 2019, 3 p.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 43.0 ppb (33) 0.2 ppb (2) N/A 12.7 μg/m3 (51) 51.0
 
May 17, 2019, 2 p.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 40.0 ppb (31) 0.2 ppb (2) N/A 12.4 μg/m3 (51) 51.0
 
May 17, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 13.3 μg/m3 (53) 53.0
 
May 17, 2019, noon N/A N/A N/A N/A N/A N/A N/A N/A N/A 14.0 μg/m3 (54) 54.0
 
May 17, 2019, 11 a.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 20.0 ppb (15) 0.3 ppb (3) N/A 13.6 μg/m3 (53) 53.0
 
May 17, 2019, 10 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 22.0 ppb (17) 0.2 ppb (2) N/A 13.8 μg/m3 (54) 54.0
 
May 17, 2019, 9 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 24.0 ppb (18) 0.2 ppb (2) N/A 12.8 μg/m3 (52) 52.0
 
May 17, 2019, 8 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 24.0 ppb (18) 0.1 ppb (1) N/A 12.3 μg/m3 (51) 51.0
 
May 17, 2019, 7 a.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 25.0 ppb (19) 0.2 ppb (2) N/A 12.2 μg/m3 (50) 50.0
 
May 17, 2019, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 27.0 ppb (21) 0.2 ppb (2) N/A 13.0 μg/m3 (52) 52.0
 
May 17, 2019, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 20.0 ppb (15) 0.2 ppb (2) N/A 13.0 μg/m3 (52) 52.0
 
May 17, 2019, 4 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 19.0 ppb (15) 0.3 ppb (3) N/A 11.8 μg/m3 (49) 49.0
 
May 17, 2019, 3 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 22.0 ppb (17) 0.3 ppb (3) N/A 11.5 μg/m3 (48) 48.0
 
May 17, 2019, 2 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 29.0 ppb (22) 0.3 ppb (3) N/A 11.3 μg/m3 (47) 47.0
 
May 17, 2019, 1 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 31.0 ppb (24) 0.3 ppb (3) N/A 10.1 μg/m3 (42) 42.0